Identify the values for which the rational expression is undefined.
A. r = 4
B. r = 0
C. r = -4
D. None
Answer: C
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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 = 5.5 in.; d = 9.5 in. B. w = 6.5 in.; d = 10.5 in. C. w = 6.5 in.; d = 8.5 in. D. w = 4.5 in.; d = 10.5 in.
Solve the equation.3(6 + 3x) = 
A. 
B. {9}
C. {3}
D. {-3}
Solve the problem.A person is watching a car from the top of a building. The car is traveling on a straight road directly toward the building. When first noticed the angle of depression to the car is 26° 50' . When the car stops, the angle of depression is 46° 45' . The building is 270 feet tall. How far did the car travel from when it was first noticed until it stopped? Round your answer to the hundredths place.
A. 479.85 ft B. 305.96 ft C. 258.68 ft D. 279.75 ft
Find the standard deviation of the probability density function to the nearest hundredth.f(x) = 2(1 - x); [0, 1]
A. 0.33 B. 0.31 C. 0.24 D. 0.25