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. 2 sec and 4 sec
C. 1 sec and 2 sec
D. 1 sec
Answer: C
Mathematics
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Add or subtract as indicated.(7x2 - xy - y2) + (x2 + 3xy + 6y2)
A. 6x2 - 4xy - 7y2 B. 8x2 + 2xy + 5y2 C. 7x2 + 3xy + 6y2 D. 8x2 + 4xy + 7y2
Mathematics
Write a general formula to describe the variation.The volume V of a right circular cone varies directly with the square of its base radius r and its height h. The constant of proportionality is 
?.
A. V = 
r2h
B. V = 
?r2h2
C. V = 
?r2h
D. V = 
?rh
Mathematics
A business has a cost (in dollars) of 
for producing x units. What is the limit of 
as x approaches infinity?
?
A. ?? B. ?$0.40 C. ?$900.40 D. ?$900.00 E. ?$899.60
Mathematics
Solve the initial-value problem.
Mathematics