Filters
Question type

Study Flashcards

Analytically determine the location(s) of any vertical asymptote(s) . Round your answer to two decimal places. Analytically determine the location(s)  of any vertical asymptote(s) . Round your answer to two decimal places.   ​ A)    B)    C)    D)    E) no vertical asymptotes


A) Analytically determine the location(s)  of any vertical asymptote(s) . Round your answer to two decimal places.   ​ A)    B)    C)    D)    E) no vertical asymptotes
B) Analytically determine the location(s)  of any vertical asymptote(s) . Round your answer to two decimal places.   ​ A)    B)    C)    D)    E) no vertical asymptotes
C) Analytically determine the location(s)  of any vertical asymptote(s) . Round your answer to two decimal places.   ​ A)    B)    C)    D)    E) no vertical asymptotes
D) Analytically determine the location(s)  of any vertical asymptote(s) . Round your answer to two decimal places.   ​ A)    B)    C)    D)    E) no vertical asymptotes
E) no vertical asymptotes

F) B) and D)
G) A) and B)

Correct Answer

verifed

verified

A graph of A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)   is given. Use the graph to determine where f (x) is decreasing. ​ A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)   A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)


A) A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)
B) A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)
C) A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)
D) A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)
Or A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)
E) A graph of   is given. Use the graph to determine where f (x)  is decreasing. ​   ​   A)    B)    C)    D)    Or   E)

F) B) and C)
G) A) and E)

Correct Answer

verifed

verified

Analytically determine the location of any vertical asymptotes. Round your answer to two decimal places. Analytically determine the location of any vertical asymptotes. Round your answer to two decimal places.   A)    B)    C)    D)    E) no vertical asymptotes


A) Analytically determine the location of any vertical asymptotes. Round your answer to two decimal places.   A)    B)    C)    D)    E) no vertical asymptotes
B) Analytically determine the location of any vertical asymptotes. Round your answer to two decimal places.   A)    B)    C)    D)    E) no vertical asymptotes
C) Analytically determine the location of any vertical asymptotes. Round your answer to two decimal places.   A)    B)    C)    D)    E) no vertical asymptotes
D) Analytically determine the location of any vertical asymptotes. Round your answer to two decimal places.   A)    B)    C)    D)    E) no vertical asymptotes
E) no vertical asymptotes

F) A) and E)
G) B) and E)

Correct Answer

verifed

verified

For the given function, find the horizontal points of inflection. ​ For the given function, find the horizontal points of inflection. ​   ​ A)    B)    C)    D)    E) no horizontal points of inflection


A) For the given function, find the horizontal points of inflection. ​   ​ A)    B)    C)    D)    E) no horizontal points of inflection
B) For the given function, find the horizontal points of inflection. ​   ​ A)    B)    C)    D)    E) no horizontal points of inflection
C) For the given function, find the horizontal points of inflection. ​   ​ A)    B)    C)    D)    E) no horizontal points of inflection
D) For the given function, find the horizontal points of inflection. ​   ​ A)    B)    C)    D)    E) no horizontal points of inflection
E) no horizontal points of inflection

F) A) and B)
G) A) and C)

Correct Answer

verifed

verified

The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows: Region1: The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows: Region1:   Region2:   where   and   are the sales revenue in millions of dollars, and   and   are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars. A) $14 million B) $39 million C) $25 million D) $18 million E) $19 million Region2: The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows: Region1:   Region2:   where   and   are the sales revenue in millions of dollars, and   and   are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars. A) $14 million B) $39 million C) $25 million D) $18 million E) $19 million where The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows: Region1:   Region2:   where   and   are the sales revenue in millions of dollars, and   and   are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars. A) $14 million B) $39 million C) $25 million D) $18 million E) $19 million and The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows: Region1:   Region2:   where   and   are the sales revenue in millions of dollars, and   and   are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars. A) $14 million B) $39 million C) $25 million D) $18 million E) $19 million are the sales revenue in millions of dollars, and The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows: Region1:   Region2:   where   and   are the sales revenue in millions of dollars, and   and   are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars. A) $14 million B) $39 million C) $25 million D) $18 million E) $19 million and The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows: Region1:   Region2:   where   and   are the sales revenue in millions of dollars, and   and   are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars. A) $14 million B) $39 million C) $25 million D) $18 million E) $19 million are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars.


A) $14 million
B) $39 million
C) $25 million
D) $18 million
E) $19 million

F) A) and C)
G) C) and D)

Correct Answer

verifed

verified

Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​ Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and     ​ A) C B) F C) I D) A E) B and Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and     ​ A) C B) F C) I D) A E) B Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and     ​ A) C B) F C) I D) A E) B


A) C
B) F
C) I
D) A
E) B

F) B) and E)
G) B) and C)

Correct Answer

verifed

verified

Use the indicated Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And  -values on the graph of Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And  to find all the intervals where Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And  . Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And


A) Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And
B) Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And
And Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And
C) Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And
D) Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And
E) Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And
And Use the indicated   -values on the graph of   to find all the intervals where   .   A)    B)    And   C)    D)    E)    And

F) B) and D)
G) All of the above

Correct Answer

verifed

verified

Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)   , Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)   , where x is the number of machines used. Find the critical values of Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)   that lie in the domain of the problem. ​ ​


A) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)
B) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)
C) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)
D) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)
E) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Find the critical values of   that lie in the domain of the problem. ​ ​ A)    B)    C)    D)    E)

F) A) and B)
G) C) and D)

Correct Answer

verifed

verified

The profit function for a commodity is The profit function for a commodity is   dollars. Find the maximum profit. Round your answer to the nearest dollar. ​​ A)    B)    C)    D)    E)   dollars. Find the maximum profit. Round your answer to the nearest dollar. ​​


A) The profit function for a commodity is   dollars. Find the maximum profit. Round your answer to the nearest dollar. ​​ A)    B)    C)    D)    E)
B) The profit function for a commodity is   dollars. Find the maximum profit. Round your answer to the nearest dollar. ​​ A)    B)    C)    D)    E)
C) The profit function for a commodity is   dollars. Find the maximum profit. Round your answer to the nearest dollar. ​​ A)    B)    C)    D)    E)
D) The profit function for a commodity is   dollars. Find the maximum profit. Round your answer to the nearest dollar. ​​ A)    B)    C)    D)    E)
E) The profit function for a commodity is   dollars. Find the maximum profit. Round your answer to the nearest dollar. ​​ A)    B)    C)    D)    E)

F) A) and B)
G) All of the above

Correct Answer

verifed

verified

Use the sign diagram for Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)   to determine the largest interval on which f (x) increases, where Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)   and Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)   . Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)


A) Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)
B) Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)
C) Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)
D) Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)
E) Use the sign diagram for   to determine the largest interval on which f (x)  increases, where   and   .   A)    B)    C)    D)    E)

F) A) and C)
G) B) and C)

Correct Answer

verifed

verified

Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ A) ​   B)    C)    D)    E)   , Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ A) ​   B)    C)    D)    E)   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​


A) ​ Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ A) ​   B)    C)    D)    E)
B) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ A) ​   B)    C)    D)    E)
C) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ A) ​   B)    C)    D)    E)
D) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ A) ​   B)    C)    D)    E)
E) Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by   ,   , where x is the number of machines used. Over what interval in the domain do average costs decrease? ​ A) ​   B)    C)    D)    E)

F) B) and E)
G) A) and D)

Correct Answer

verifed

verified

A travel agency will plan a tour for groups of size 8 or larger. If the group contains exactly 8 people, the price is $800 per person. However, each person's price is reduced by $10 for each additional person above the 8. If the travel agency incurs a price of $100 per person for the tour, what size group will give the agency the maximum profit? ​​


A) A travel agency will plan a tour for groups of size 8 or larger. If the group contains exactly 8 people, the price is $800 per person. However, each person's price is reduced by $10 for each additional person above the 8. If the travel agency incurs a price of $100 per person for the tour, what size group will give the agency the maximum profit? ​​ A)    B)    C)    D)    E)
B) A travel agency will plan a tour for groups of size 8 or larger. If the group contains exactly 8 people, the price is $800 per person. However, each person's price is reduced by $10 for each additional person above the 8. If the travel agency incurs a price of $100 per person for the tour, what size group will give the agency the maximum profit? ​​ A)    B)    C)    D)    E)
C) A travel agency will plan a tour for groups of size 8 or larger. If the group contains exactly 8 people, the price is $800 per person. However, each person's price is reduced by $10 for each additional person above the 8. If the travel agency incurs a price of $100 per person for the tour, what size group will give the agency the maximum profit? ​​ A)    B)    C)    D)    E)
D) A travel agency will plan a tour for groups of size 8 or larger. If the group contains exactly 8 people, the price is $800 per person. However, each person's price is reduced by $10 for each additional person above the 8. If the travel agency incurs a price of $100 per person for the tour, what size group will give the agency the maximum profit? ​​ A)    B)    C)    D)    E)
E) A travel agency will plan a tour for groups of size 8 or larger. If the group contains exactly 8 people, the price is $800 per person. However, each person's price is reduced by $10 for each additional person above the 8. If the travel agency incurs a price of $100 per person for the tour, what size group will give the agency the maximum profit? ​​ A)    B)    C)    D)    E)

F) C) and D)
G) D) and E)

Correct Answer

verifed

verified

For the given function and graph, estimate the coordinates of the relative minima by observing the graph, where For the given function and graph, estimate the coordinates of the relative minima by observing the graph, where   .   ​   A)    B)    C)    D)    E) no relative minima . For the given function and graph, estimate the coordinates of the relative minima by observing the graph, where   .   ​   A)    B)    C)    D)    E) no relative minimaFor the given function and graph, estimate the coordinates of the relative minima by observing the graph, where   .   ​   A)    B)    C)    D)    E) no relative minima


A) For the given function and graph, estimate the coordinates of the relative minima by observing the graph, where   .   ​   A)    B)    C)    D)    E) no relative minima
B) For the given function and graph, estimate the coordinates of the relative minima by observing the graph, where   .   ​   A)    B)    C)    D)    E) no relative minima
C) For the given function and graph, estimate the coordinates of the relative minima by observing the graph, where   .   ​   A)    B)    C)    D)    E) no relative minima
D) For the given function and graph, estimate the coordinates of the relative minima by observing the graph, where   .   ​   A)    B)    C)    D)    E) no relative minima
E) no relative minima

F) C) and D)
G) B) and E)

Correct Answer

verifed

verified

A vacationer on an island 8 miles offshore from a point that is 48 miles from a town to which the vacationer must travel occasionally. (See the figure.) The vacationer has a boat capable of traveling 30 mph and can go by auto along the coast at 55 mph. At what distance x from the point on shore closest to the vacationer on the island should the boat be left to minimize the time it takes to get to town? Round your answer to one decimal place. ​ A vacationer on an island 8 miles offshore from a point that is 48 miles from a town to which the vacationer must travel occasionally. (See the figure.)  The vacationer has a boat capable of traveling 30 mph and can go by auto along the coast at 55 mph. At what distance x from the point on shore closest to the vacationer on the island should the boat be left to minimize the time it takes to get to town? Round your answer to one decimal place. ​   Where   ,   ​ A) ​6.1 miles B) ​5.2 miles C) ​5.9 miles D) ​3.8 miles E) ​4.3 miles Where A vacationer on an island 8 miles offshore from a point that is 48 miles from a town to which the vacationer must travel occasionally. (See the figure.)  The vacationer has a boat capable of traveling 30 mph and can go by auto along the coast at 55 mph. At what distance x from the point on shore closest to the vacationer on the island should the boat be left to minimize the time it takes to get to town? Round your answer to one decimal place. ​   Where   ,   ​ A) ​6.1 miles B) ​5.2 miles C) ​5.9 miles D) ​3.8 miles E) ​4.3 miles , A vacationer on an island 8 miles offshore from a point that is 48 miles from a town to which the vacationer must travel occasionally. (See the figure.)  The vacationer has a boat capable of traveling 30 mph and can go by auto along the coast at 55 mph. At what distance x from the point on shore closest to the vacationer on the island should the boat be left to minimize the time it takes to get to town? Round your answer to one decimal place. ​   Where   ,   ​ A) ​6.1 miles B) ​5.2 miles C) ​5.9 miles D) ​3.8 miles E) ​4.3 miles


A) ​6.1 miles
B) ​5.2 miles
C) ​5.9 miles
D) ​3.8 miles
E) ​4.3 miles

F) B) and E)
G) C) and E)

Correct Answer

verifed

verified

Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​ Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and     A) ​I B) F C) C D) D E) H and Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and     A) ​I B) F C) C D) D E) H Use the graph shown in the figure and identify points from A through I that satisfy the given condition. ​   and     A) ​I B) F C) C D) D E) H


A) ​I
B) F
C) C
D) D
E) H

F) A) and C)
G) D) and E)

Correct Answer

verifed

verified

The following figure shows the graph of revenue function The following figure shows the graph of revenue function   and cost function   . At which of the four x-values shown is the slope of the tangent to the revenue curve equal to the slope of the tangent to the cost curve? ​   A) ​D B) B C) C D) A E) profit largest at more than one x-value and cost function The following figure shows the graph of revenue function   and cost function   . At which of the four x-values shown is the slope of the tangent to the revenue curve equal to the slope of the tangent to the cost curve? ​   A) ​D B) B C) C D) A E) profit largest at more than one x-value . At which of the four x-values shown is the slope of the tangent to the revenue curve equal to the slope of the tangent to the cost curve? ​ The following figure shows the graph of revenue function   and cost function   . At which of the four x-values shown is the slope of the tangent to the revenue curve equal to the slope of the tangent to the cost curve? ​   A) ​D B) B C) C D) A E) profit largest at more than one x-value


A) ​D
B) B
C) C
D) A
E) profit largest at more than one x-value

F) A) and E)
G) B) and D)

Correct Answer

verifed

verified

A company needs 300 items per year. Production costs are $70 to prepare for a production run and $6 for each item produced. Inventory costs are $0.75 per item per year. Find the number of items that should be produced in each run so that the total costs of production and storage are minimized. ​​


A) 237 items
B) 287 items
C) 276 items
D) 265 items
E) 254 items

F) C) and D)
G) B) and E)

Correct Answer

verifed

verified

For the given function, use the graph to identify x-values for which For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)   . You may use the derivative to check your conclusion. ​ For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)   For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)


A) For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)
B) For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)
C) For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)
D) For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)
E) For the given function, use the graph to identify x-values for which   . You may use the derivative to check your conclusion. ​     A)    B)    C)    D)    E)

F) A) and D)
G) D) and E)

Correct Answer

verifed

verified

A function and its graph are given. From the graph estimate where A function and its graph are given. From the graph estimate where   has a relative minimum. ​   ​   ​ A)    B)    C)    D)    E) no relative minima has a relative minimum. ​ A function and its graph are given. From the graph estimate where   has a relative minimum. ​   ​   ​ A)    B)    C)    D)    E) no relative minimaA function and its graph are given. From the graph estimate where   has a relative minimum. ​   ​   ​ A)    B)    C)    D)    E) no relative minima


A) A function and its graph are given. From the graph estimate where   has a relative minimum. ​   ​   ​ A)    B)    C)    D)    E) no relative minima
B) A function and its graph are given. From the graph estimate where   has a relative minimum. ​   ​   ​ A)    B)    C)    D)    E) no relative minima
C) A function and its graph are given. From the graph estimate where   has a relative minimum. ​   ​   ​ A)    B)    C)    D)    E) no relative minima
D) A function and its graph are given. From the graph estimate where   has a relative minimum. ​   ​   ​ A)    B)    C)    D)    E) no relative minima
E) no relative minima

F) B) and D)
G) A) and C)

Correct Answer

verifed

verified

A firm can produce 100 units per week. If its total cost function is A firm can produce 100 units per week. If its total cost function is   dollars, and its total revenue function is   dollars, find the maximum profit. A) $8,756 B) $2,200 C) $6,300 D) $6,313 E) $7,141 dollars, and its total revenue function is A firm can produce 100 units per week. If its total cost function is   dollars, and its total revenue function is   dollars, find the maximum profit. A) $8,756 B) $2,200 C) $6,300 D) $6,313 E) $7,141 dollars, find the maximum profit.


A) $8,756
B) $2,200
C) $6,300
D) $6,313
E) $7,141

F) A) and B)
G) All of the above

Correct Answer

verifed

verified

Showing 61 - 80 of 172

Related Exams

Show Answer