The following graph relates the average number of words participants in a psychology experiment were able to memorize in a given amount of time.
Use the graph to answer the following:
(a) Estimate the number of words memorized after 10 min.
(b) After how many minutes is the number of words memorized approximately six?
(a) 9
(b) 8 min
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Solve the problem.The stiffness of a rectangular beam is proportional to its width times the cube of its depth. Find the dimensions of the stiffest beam than can be cut from a 
cylindrical log. (Round answers to the nearest tenth.)
A. w = 7.0 in.; d = 11.4 in. B. w = 5.0 in.; d = 11.4 in. C. w = 6.0 in.; d = 10.4 in. D. w = 7.0 in.; d = 9.4 in.
Solve the problem.The strength S of a rectangular wooden beam is proportional to its width times the square of its depth. Find the dimensions of the strongest beam that can be cut from a 
cylindrical log. (Round answers to the nearest tenth.)
A. w = 6.8 in.; d = 9.2 in. B. w = 4.8 in.; d = 9.2 in. C. w = 5.8 in.; d = 8.2 in. D. w = 6.8 in.; d = 7.2 in.
Find the absolute value.|61|
A. -61
B. 61
C. 
D. 0
Solve the system of equations by graphing. If there is no solution or an infinite number of solutions, state this.
A. Infinite number of solutions B. (-1, 6) C. (1, 6) D. No solution