Solve the problem.The voltage E in an electrical circuit is given by E = 4.7 cos 80?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. 
B. 80
C. 
D. 40
Answer: D
Mathematics
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Find 
.exy = sin x
A. 
B. 
C. 
D. 
Mathematics
Solve the equation.a - 7 = -1
A. -8 B. -6 C. 8 D. 6
Mathematics
Solve.Seven times the sum of -182 and a number is 63. Find the number.
A. 191 B. -17 C. 35 D. -173
Mathematics
Perform the indicated operations. Simplify if possible.
+ 
- 
A. 
B. 
C. 
D. 
Mathematics