Solve the problem.The voltage E in an electrical circuit is given by E = 6.4 cos 110?t, where t is time measured in seconds. Find the period.
A. 
B. 55
C. 
D. 55?
Answer: A
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Find the logarithm. Give an approximation to four decimal places.log 193
A. 2.2856 B. 2.2878 C. 5.2627 D. 2.2833
Solve the problem.Forensic scientists use the lengths of certain bones to calculate the height of a person. When the femur (f), the bone from the knee to the hip socket is used, the following formula applies for men: 
where h is the height and f is the length of the femur. Find the height of a man with a femur measuring 69 centimeters.
A. 4921.77 cm B. 138.09 cm C. 0.04 cm D. 223.65 cm
Solve the trigonometric equation symbolically, graphically, or numerically for 
csc ? + 2 = 0
A. ? = 210°, 330° B. ? = 60°, 120°, 240°, 300° C. ? = 240°, 300° D. ? = 30°, 150°, 210°, 330°
Find and simplify the difference quotient of f, 
, for the function.f(x) = 7x - 8
A. 0
B. 7 + 
C. 7
D. 7 + 