Solve the problem.The voltage E in an electrical circuit is given by E = 1.5 cos 90?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. 45
B. 
C. 90
D. 
Answer: A
Mathematics
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Solve the problem.Frank can type a report in 4 hours and James takes 6 hours. How long will it take the two of them typing together?
A. 6 hr
B. 12 hr
C. 
hr
D. 
hr
Mathematics
Find the solutions to the system of equations by the addition method.
- 
= -18
+ 
= -9
A. (12, 0) B. (0, 12) C. (-12, 0) D. (0, -12)
Mathematics
Solve the system graphically.x + 7y = 77x - 4y = -4
A. (1, 0) B. (0, 1) C. (1, 1) D. (0, 0)
Mathematics
Solve.
- 2 = 
A. -5 B. 25 C. -25 D. empty set solution
Mathematics