Solve the problem.The voltage E in an electrical circuit is given by E = 5.9 cos 50?t, where t is time measured in seconds. Find the period.
A. 25
B. 
C. 
D. 25?
Answer: C
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Prove that the equation is an identity.
= 
What will be an ideal response?
Use the empirical probability formula to solve the exercise. Express the answer as a fraction. Then express the probability as a decimal, rounded to the nearest thousandth, if necessary.The table below represents a random sample of the number of deaths per 100 cases for a certain illness over time. If a person infected with this illness is randomly selected from all infected people, find the probability that the person lives 3-4 years after diagnosis.
A. 
; 0.35
B. 
; 0.538
C. 
; 0.058
D. 
; 0.029
Factor.t3 + 512
A. (t + 8)(t2 - 8t + 64) B. (t + 8)(t2 + 64) C. (t - 8)(t2 + 8t + 64) D. (t - 512)(t2 - 1)
Solve the system of equations using substitution.
A. x = -8, y = 5 or (-8, 5) B. x = 8, y = -5 or (8, -5) C. x = -8, y = -5 or (-8, -5) D. x = 8, y = 5 or (8, 5)