Solve the problem.The instantaneous growth rate of a population is the rate at which it is growing at every instant in time. The instantaneous growth rate r of a colony of bacteria t hours after the start of an experiment is given by the function 
for 
Find the times for which the instantaneous growth rate is zero.
A. 1 sec, 2 sec, and 4 sec
B. 1 sec
C. 2 sec and 4 sec
D. 1 sec and 2 sec
Answer: D
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Perform the indicated operation.44 ÷ (-4)
A. -11
B. - 
C. -21
D. 11
A university committee decides that there should be three instructors for every 50 students. How many instructors are needed for an enrollment of 5,400 students?
a. 108 b. 1,800 c. 324 d.150
Use the Leading Coefficient Test to determine the end behavior of the polynomial function. Then use this end behavior to match the function with its graph.f(x) = -3x2 + 3x + 1
A. rises to the left and falls to the right
B. falls to the left and rises to the right
C. falls to the left and falls to the right
D. rises to the left and rises to the right
Factor the sum or difference of two cubes.729x3 + 1
A. (9x + 1)(81x2 - 9x - 1) B. (9x + 1)(81x2 + 9x + 1) C. (9x + 1)(81x2 - 9x + 1) D. (9x + 1)(81x2 + 1)