Use similar triangles and the fact that corresponding sides are proportional to find the length of the side marked with an x.
A. 9 m
B. 4 m
C. 6 m
D. 3 m
Answer: C
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Solve the problem.The shape and density of a thin shell are indicated below. Find the coordinates of the center of mass.Shell: portion of the sphere x2 + y2 + z2 = 25 that lies in the first octantDensity: constant
A. 
B. 
C. 
D. 
Find the domain of the function.f(x) = x2 + 7
A. {x|x ? -7}, or [-7, ?) B. {x|x ? -7}, or (-?, -7) ? (-7, ?) C. {x|x > -7}, or (-7, ?) D. all real numbers, or (-?, ?)
Factor completely, or state that the polynomial is prime.9x2 - 12x + 4
A. (3x - 2)(3x + 2) B. (3x - 2)2 C. (9x + 1)(x + 4) D. (3x + 2)2
Solve the problem.The radius of a sphere is given by the formula 
, where S is the surface area. If the surface area is 16,397 square inches, what is the radius? Use 3.14 for ?, and round your answer to the nearest tenth of an inch.
A. 64 in. B. 36.1 in. C. 113.5 in. D. 0 in.