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 = 7.5 in.; d = 10.3 in.
B. w = 6.5 in.; d = 11.3 in.
C. w = 7.5 in.; d = 12.3 in.
D. w = 5.5 in.; d = 12.3 in.
Answer: B
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Find an equation for the sphere with the given center and radius.Center (-5, 4, 0), radius = 10
A. x2 + y2 + z2 - 10x - 8y = 59 B. x2 + y2 + z2 + 10x - 8y = 59 C. x2 + y2 + z2 - 10x + 8y = 59 D. x2 + y2 + z2 + 10x + 8y = 59
Use the multiplication property of inequality to solve the inequality and graph the solution set on a number line.-5x > 65
A. (13, ?)
B. (-13, ?)
C. (-?, 13)
D. (-?, -13)
Identify the terms in the given expression.-7x + 21y
A. 7x, 21y B. -7x, 21y C. -7x, -21y D. -7, x, 21, y
Use the discriminant of the equation to determine the number of x-intercepts.f(x) = -4x2 - 8x + 4
A. Two x-intercepts B. One x-intercept C. No x-intercepts