Use Descartes' Rule of Signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the function.f(x) = 9x3 - 4x2 + 5x + 2
A. 0 positive; 1 or 2 negative
B. 0 or 1 positive; 2 negative
C. 0 or 2 positive; 1 negative
D. 0 or 1 positive; 0 or 1 negative
Answer: C
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Find the odds.A number cube labeled with numbers 1, 2, 3, 4, 5, and 6 is tossed. What are the odds in favor of the cube showing a 4?
A. 1:4 B. 1:5 C. 2:3 D. 1:6
Graph the pair of parametric equations in the rectangular coordinate system.x = 3 tan t, y = 5 sec t; 0 ? t ? 2? 
A. 
B. 
C. 
D. 
Solve the problem.To remodel a bathroom, a contractor charges $25 per hour plus material costs, which amount to $3650. Therefore, the total cost to remodel the bathroom is given by 
where x is the number of hours the contractor works. Find a formula for 
What does 
compute?
A. f -1(x) = 
- 146; This computes the total cost if the contractor works x hours.
B. f -1(x) = 
- 3650; This computes the total cost if the contractor works x hours.
C. f -1(x) = 
- 3650; This computes the number of hours worked if the total cost is x dollars.
D. f -1(x) = 
- 146; This computes the number of hours worked if the total cost is x dollars.
On the basis of data collected during an experiment, a biologist found that the growth of the fruit fly (Drosophila) with a limited food supply could be approximated by the exponential model 
, where t denotes the number of days since the beginning of the experiment.
? What was the initial fruit fly population in the experiment? __________ ? What was the maximum fruit fly population that could be expected under this laboratory condition? __________ ? What was the population of the fruit fly colony on the 20th day? Please give the answer as an integer. __________ ? How fast was the population changing on the 20th day? Please give the answer as an integer. __________ What will be an ideal response?