Solve the system by the addition method. 2x + 15y = -919x + 3y = 42
A. {(-7, 7)}
B. {(7, -7)}
C. {(-3, 7)}
D. {(9, -9)}
Answer: B
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Solve the problem.Ten thousand raffle tickets are sold. One first prize of $2200, 4 second prizes of $900 each, and 10 third prizes of $400 each are to be awarded, with all winners selected randomly. If you purchase one ticket, what are your expected winnings?
A. 98 cents B. 128 cents C. 35 cents D. 164 cents
Given y = f(u) and u = g(x), find dy/dx = f'(g(x))g'(x).y = sin u, u = 4x + 19
A. - 4 cos (4x + 19) B. - cos (4x + 19) C. 4 cos (4x + 19) D. cos (4x + 19)
Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.f(x) = cos4 x
A. 
B. 
C. 
D. 
Write the x- and y-intercepts of the graph.
A. x-intercept: 1; y-intercept: - 
B. x-intercept: 1; y-intercept: 1
C. x-intercept: - 
; y-intercept: 1
D. x-intercept: - 
; y-intercept: - 