Solve the problem.If a population has a growth rate of 7.5% per year, how long to the nearest tenth of a year will it take the population to double?
A. 9.2 years
B. 9.9 years
C. 0.9 years
D. 0.1 years
Answer: A
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Evaluate the integral.
A. - 
B. 
- 
C. 
+ 
D. 
Solve the problem.When an alternating current passes through a series RLC circuit, the voltage and current are out of phase by angle ?. Here ? = tan-1[(XL - XC)/R], where XL and XC are the reactances of the inductor and capacitor, respectively, and R is the resistance. Find d?/dXL for constant XC and R.
A. 
B. 
C. 
D. 
Using a graphing calculator to graph f and g in the window [0, 6, 1] by [0, 6, 1]. Which function is greater when 
?f(x) = x3/5, g(x) = x5/3
A. g(x) B. f(x)
Solve the problem. Round your answer to the nearest whole number.In an epidemiological model used to study the spread of drug use, a single drug user is introduced into a population of N non-users. Under certain assumptions, the number of people expected to use drugs as a result of direct influence from each drug user is given by 
, where b and k are constants. Find the value of S.
A. 3Ne-bkt B. 3N/(b + k) C. N(1 - e-kt)e-bt D. 3N/[b(b + k)]