Solve.An equation that can be used to predict the median age N (in years) of the population of the United States is N = 33.62 + 1.0249 ln x, where x is the number of years. Use the equation to find the median age of the U.S. population in 6 years. If necessary, round to the nearest hundredth.
A. 34.418
B. 35.456
C. 35.412
D. 33.62
Answer: B
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Use the inverse trig functions to express the angle in terms of the indicated unknown side. 
Use one of the inverse trig functions csc-1 or sec-1 to express angle A in terms of c.
A. A = sec-1 
B. A = csc-1 
C. A = sec-1 
D. A = csc-1 
Experiments conducted by A. J. Clark suggest that the response R(x) of a frog's heart muscle to the injection of x units of acetylcholine (as a percent of the maximum possible effect of the drug) may be approximated by the rational function
?
?
where b is a positive constant that depends on the particular frog. If a concentration of 20 units of acetylcholine produces a response of 40% for a certain frog, find the "response function" for this frog.
What will be an ideal response?
Solve the problem.A ball is dropped from a cliff that is 480 feet high. The distance S (in feet) that it falls in t seconds is given by the formula S = 16t2. How many seconds (to tenths) will it take for the ball to hit the ground?
A. 14,400 sec B. 21.5 sec C. 21.9 sec D. 5.5 sec
Evaluate the expression without using a calculator.log9
A. 
B. 9
C. 1
D. 