Use a half-angle identity to find an exact value for the following, given the information about x. Find cos 
, given that sin x = 
and 360° < x < 450°.
A. 
B. - 
C. 
D. - 
Answer: D
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Use Cramer's rule to solve the linear system. If D = 0, use another method to determine the solution set. 7x + 3y - z = 30 x + 6y + 7z = 52-6x + y + z = -4
A. {(2, -6, -2)} B. {(6, 2, 6)} C. {(2, 6, 2)} D. {(3, 4, 2)}
Factor out the greatest common factor.2x2 - 18x
A. 2(x2 - 9x) B. 2x(x - 9) C. x(2x - 18) D. 2x(x - 9x)
For those which are polynomial functions, find the degree, the leading term, and the leading coefficient.f(x) = 5 + 6x - 7x3
A. Degree: 3, leading term: -7x3, leading coefficient: -7 B. not a polynomial function C. Degree: 0, leading term: 5, leading coefficient: 5 D. Degree: 3, leading term: -7, leading coefficient: 5
Simplify the difference quotient 
and 
for the following function.f(x) = 4x2 + 9x - 1
A. 8x2 + h B. 8x + 8h + 9 C. 8x + 4h + 9 D. 8x + 9h - 1