The inverse of 
is
?
A. 
B. 
C. 
D. 
Answer: A
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Find the exact value of the expression.cos-1 (-1)
A. 0
B. 2?
C. 
D. ?
Solve the equation.
- 
= 
A. ? B. {7} C. {-1} D. {1}
Solve the problem.A survey of the interest rates earned by Certificates of Deposit (CDs) showed the following percents for the length of time (in years) for holding the CD. Let length of time represent the independent variable and interest rate represent the dependent variable. Use a graphing utility to draw a scatter diagram and to find the line of best fit. What is the estimate of the interest rate for a CD held for 30 years (to the nearest thousandth)? 
A. 8.874 B. 9.064 C. 8.675 D. 8.669
Solve the problem.The concentration C (arbitrary units) of a certain drug in a patient's bloodstream can be modeled using 
where t is the number of hours since a 500 milligram oral dose was administered. Using the TABLE feature of a graphing utility, find the time at which the concentration of the drug is greatest. Round to the nearest tenth of an hour.
A. 5.6 hours B. 6.4 hours C. 4.1 hours D. 4.9 hours