A population changes with time. Its level after t years is given by the function 
. After a period of population decrease, the population reaches a minimum value. What can be said about 
at this time?
?
A. is positive.
B. is negative.
C. is zero.
D. is linear.
Answer: C
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Use the information in the table to solve the problem. Write your answer as a fraction in lowest terms.The table below shows the amounts of pollutants (in parts per million) in a sample of rainwater.
Find the ratio of pollutant C to pollutant A.
A. 
B. 
C. 
D. 
Solve the problem.A cab company charges a base rate of $2.00 plus 20 cents per minute. Let y be the cost in dollars of using the cab for x minutes. Find the slope-intercept form of the equation.
A. y = 2.00x - 0.20 B. y = 0.20x + 2.00 C. y = 0.20x - 2.00 D. y = 2.00x + 0.20
Solve for the base. Round to the nearest cent.Part: $882.00 Rate of decrease: 14%
A. $882.00 B. $758.52 C. $1,025.58 D. $1,125.58
Find an upper bound for the magnitude |E| of the error in the linear approximation L to f at the given point over the given region.
at 
R: |x + 7| ? 0.1, |y + 10| ? 0.1
A. |E| ? 0.02 B. |E| ? 0.04 C. |E| ? 0.06 D. |E| ? 0.08