Solve. Give an exact answer unless indicated otherwise.A generator produces an alternating current according to the equation 
, where t is time in seconds and I is the current in amperes. What is the smallest time t such that I = 20?
A. 
sec
B. 
sec
C. 
sec
D. 
sec
Answer: B
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Find the unknown value.3.1 is what percent of 4?
A. 78.5% B. 82.5% C. 77.5% D. 75.5%
First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.James is taking a road to Calistoga. He has already driven 73.38 kilometers. If the entire distance to Calistoga is 115 kilometers, how much further must James drive?
A. Estimate: 30 kilometers; exact: 42.62 kilometers B. Estimate: 30 kilometers; exact: 41.72 kilometers C. Estimate: 40 kilometers; exact: 51.62 kilometers D. Estimate: 30 kilometers; exact: 41.62 kilometers
Find the probability of the result using the normal curve approximation to the binomial distribution.A battery company has found that the defective rate of its batteries is 0.03. Each day, 400 batteries are randomly tested. On Tuesday, 14 are found to be defective.
A. .6141 B. .1180 C. .1105 D. .0973
If 
and 
, find csc ?.
?
A. 
B. 
C. 
D. 
E. 