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
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Write the fraction in lowest terms.
A. 
B. 
C. 
D. 13
Two functions f and g are related by the given equation. Use the numerical representation of f to make a numerical representation of g.g(x) = f(x + 1) 
A. 
B. 
C. 
D. 
Solve the problem.A certain radioactive isotope has a half-life of approximately 1750 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 35% of that amount?
A. 1138 yr B. 1088 yr C. 2651 yr D. 2616 yr
Find the focus and directrix of the parabola with the given equation.y2 = 28x
A. Focus: (7, 0), directrix: x = -7 B. Focus: (0, 7), directrix: y = -7 C. Focus: (-7, 0), directrix: x = 7 D. Focus: (0, -7), directrix: y = 7