Solve the problem.The population of a particular city is increasing at a rate proportional to its size. It follows the function 
where k is a constant and t is the time in years. If the current population is 47,000, in how many years is the population expected to be 117,500?
A. 18 yr
B. 31 yr
C. 193 yr
D. 13 yr
Answer: B
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Fill in the blank with the appropriate symbol, ? or ? .6.3 
{x|x is a rational number smaller than 6}
A. ? B. ?
Solve.x2/3 - 7x1/3 + 10 = 0
A. 8, 125 B. -125, -8 C. 2, 5 D. -5, -2
The chemical acidity of a solution is measured in units of pH: 
where 
is the hydrogen ion concentration in the solution. If a sample of rain has a pH of 3.4, how many times higher is its 
than pure water's, which has a pH of 7?
a. 
b. 
c. 7
d. 
e. 
Solve the problem.A plant population experiences seasonal growth. At time t, the population, f(t), is modeled by f(t) = 600e1.5sin(t) .Find the maximum and minimum values of f(t) and the values of t where they occur.
A. Maximum: 2689 when t = 
+ 2?n, where n is any integer
Minimum: 134 when t = 
+ 2?n
B. Maximum: 2689 when t = 2?n, where n is any integer
Minimum: 134 when t = ? + 2?n
C. Maximum: 600 when t = 
+ 2?n, where n is any integer
Minimum: -600 when t = 
+ 2?n
D. Maximum: 1733 when t = 
+ 2?n, where n is any integer
Minimum: 208 when t = 
+ 2?n