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 = 6.5; d = 11.3
B. w = 7.5; d = 12.3
C. w = 7.5; d = 10.3
D. w = 5.5; d = 12.3
Answer: A
Mathematics
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