Solve the problem.Use the formula N = Iekt, where N is the population at time t, I is the initial population, and k is a growth constant equal to the percent of growth (expressed in decimal form) per unit of time. How long will it take for the population of a certain country to double if its annual growth rate is 3.5%? Round your answer to the nearest year.
A. 57 yr
B. 9 yr
C. 20 yr
D. 1 yr
Answer: C
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The weight w of a certain animal satisfies an equation of change. At a specific weight, the equation of change indicates that 
is negative. What can you conclude about how the animal's weight can be expected to change?
?
A. The weight will stay the same. B. The animal will gain weight. C. The animal will lose weight. D. The weight is at a maximum value.
Find the area.
A. 1350 cm2 B. 812.5 cm2 C. 1625 cm2 D. 1250 cm2
Decide whether the relation is a function.{(-5, 8), (-3, -3), (-1, -5), (-1, -7)}
A. function B. not a function
Solve the problem.A certain electronic air cleaner is capable of filtering x liters of air per second and the percentage of the contaminants that are removed from the air may be calculated by 
where 
Graph f in [0,85,5] by 
Then, use the intersection-of-graphs method to estimate the x-values where 75% to 95% of the pollutants are removed.
height="180" width="180" />
A. 75% to 95% are removed when
about 36 to 47 liters of air are
filtered.
B. 75% to 95% are removed when
about 25 to 33 liters of air are
filtered.
C. 75% to 95% are removed when
about 45 to 56 liters of air are
filtered.
D. 75% to 95% are removed when
about 27 to 36 liters of air are
filtered.