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.
Answer: C
Mathematics
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