For the given functions f and g, find the requested function.If f(x) = x2 + 6x and g(x) = x + 4, find (g ? f)(2).
A. 72
B. 96
C. 22
D. 20
Answer: D
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Sketch a typical level surface for the function.f(x, y, z) = e(x2 + y2 + z2)
A. 
B. 
C. 
D. 
Find the differential of the function.y = sec 7x
A. 7 sec x tan x dx B. 7 sec 7x cot 7x dx C. - sec 7x tan 7x dx D. 7 sec 7x tan 7x dx
Answer the question.What is the smallest number that can be used to fill in the blank to make a true statement?If 
points are chosen in or on the boundary of a square with a side of length 8 cm, at least two of them must be no more than 4
cm apart.
A. 5 B. 6 C. 4 D. 8
Use a proportion to solve the problem.If a spring stretches 2 meters when a 6-kilogram weight is attached to it, how much will it stretch when a 30-kilogram weight is attached to it?
A. 10 meters B. 9 meters C. 12 meters D. 13 meters