Solve the problem.The voltage E in an electrical circuit is given by E = 5.9 cos 180?t, where t is time measured in seconds. Find the period.
A. 90
B. 
C. 
D. 90?
Answer: C
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Calculate the derivative of the function. Then find the value of the derivative as specified.
t = -2 if s = t2 - t
A. 
= 2t - 1; 
t = -2
= -5
B. 
= 2t + 1; 
t = -2
= -3
C. 
= 2 - t; 
t = -2
= 4
D. 
= t - 1; 
t = -2
= -3
Determine whether 9 is a factor of the number.11,961
A. Yes B. No
Identify the given number as "Rational", "Irrational", or "Not a real number". If the number is rational, give its exact value. If the number is irrational, give a decimal approximation to the nearest thousandth.
A. Irrational, 8.000 B. Rational, 8.000 C. Not a real number D. Rational, 4
Solve the problem.A life insurance company uses the following rate table for annual premiums for women for term life insurance. Use a graphing utility to fit the data with an exponential function in the form A = A0ekt. Round the values to the nearest thousandth. Then, use the function to predict the annual premium, to the nearest dollar, for a woman 70 years old. 
A. y = -3644.854 + 1023.386 ln x, $703 B. y = 8.944e0.068x, $1044 C. y = 8.944e0.068x, $1467 D. y = -3644.854 + 1023.386 ln x, $773