Simplify. Assume that all variables represent positive numbers.
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.Find the center and radius of the sphere with equation 3x2 + 3y2 + 3z2 - 2x + 2y - 9 = 0
A. center = 
; radius = 
B. center = 
; radius = 
C. center = 
; radius = 
D. center = 
; radius = 
Find the indicated probability or percentage for the normally distributed variable.At a local college, times for running the mile are approximately normally distributed with a mean of 4.5 minutes, and a standard deviation of 
What is the probability that a randomly selected time will be less than 4 minutes?
A. 0.274 B. 0.953 C. 0.227 D. 0.047
Find the unknown number in the proportion. Round answer to the nearest hundredth when necessary.
= 
A. x = 19 B. x = 9.5 C. x = 0.03 D. x = 38
Evaluate the expression for the given value of the variable or variables.2x2 - 8xy + 3y2; x = -4, y = -5
A. 139 B. -53 C. -62 D. 129