Find the value of (f ? g)' at the given value of x.f(u) = 
, u = g(x) = 
, x = 9
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Use Cramer's rule to solve the linear system. If D = 0, use another method to determine the solution set.x + y = 1x + y = 8
A. {(0, 9)} B. Cramer's rule does not apply since D = 0; ? C. Cramer's rule does not apply since D = 0; {(8 - y, y)} D. {(1, 8)}
Mathematics
Find a polynomial equation with real coefficients that has the given roots.4i, 
A. x4 + 9x2 - 112 = 0 B. x4 + 18x2 + 112 = 0 C. x4 - 18x2 + 112 = 0 D. x4 - 9x2 - 112 = 0
Mathematics
Multiply.(x - 6)(5x - 9)
A. 5x2 + 54x - 39 B. x2 - 39x - 39 C. 5x2 - 39x + 54 D. 5x2 - 40x + 54
Mathematics
Solve the problem.It takes 11 hours for 6 people to paint a house. How long will it take 3 people to do the job?
A. 5.8 hr B. 5.5 hr C. 24.2 hr D. 22 hr
Mathematics