Decide if the expression is factored.x2 + 21x
A. No
B. Yes
Answer: A
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Write the reciprocal of the number.- 
A. 
B. 16
C. -16
D. - 
Find the center and the radius of the circle.(x + 3)2 + (y - 2)2 = 4
A. center (-2, 3); radius = 4 B. center (3, -2); radius = 4 C. center (-3, 2); radius = 2 D. center (2, -3); radius = 2
Estimate the sum as indicated. Then answer the question.Estimate the following sum by first rounding to the nearest hundred. Does the estimate give you reason to doubt the stated sum?
A. Estimate: 52,600 ; yes B. Estimate: 52,500 ; yes C. Estimate: 52,600 ; no D. Estimate: 52,500 ; no
For the given functions f and g, find the requested function and state its domain.f(x) = 16 - x2; g(x) = 4 - xFind f + g.
A. (f + g)(x) = 4 + x; {x|x ? -4} B. (f + g)(x) = x3 - 4x2 - 16x + 64; all real numbers C. (f + g)(x) = -x2 - x + 20; all real numbers D. (f + g)(x) = -x2 + x + 12; all real numbers