Find the exact value of y, or state that y is undefined.y = cos-1
A. 
B. 
C. 0
D. ?
Answer: D
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Evaluate the integral.
dx
A. 
sin 4x - 
sin3 4x + C
B. 5 sin 4x - 
sin3 4x + C
C. 
sin 4x - 
cos3 4x + C
D. 
sin 4x + 
sin3 4x + C
Solve the problem.The voltage E in an electrical circuit is given by E = 5.8 cos 30?t, where t is time measured in seconds. Find the frequency of the function (that is, find the number of cycles or periods completed in one second).
A. 15
B. 
C. 30
D. 
Use your grapher to determine which of the graphs matches the given polar equation.r = 3 sin 2?
A. 
B. 
C. 
D. 
Solve.Two plumbers make house calls. One charges $90 for a visit plus $40 per hour of work. The other charges $70 per visit plus $50 per hour of work. For how many hours of work do the two plumbers charge the same?
A. 2 hr B. 2.5 hr C. 1.5 hr D. 1 hr