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. 2 sec and 4 sec
B. 1 sec and 2 sec
C. 1 sec, 2 sec, and 4 sec
D. 1 sec
Answer: B
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Solve the problem. Round to the nearest cent unless otherwise noted.A refrigerator that sells for $589.00 is discounted for 40% off the regular price. What is the amount of the discount?
A. $195.60 B. $235.60 C. $237.10 D. $231.60
Solve the equation.|
n + 2| = |
n - 2|
A. {16, 12} B. {16, 0} C. ? D. {0}
Determine where the graph of the function 
is concave upward and where it is concave downward. Also, find all inflection points of the function.
Select the correct answer. a. CU on (?2, 2), IP none b. CU on (??, ?2) and (2, ?), CD on (?2, 2), IP (?2, ?18) and (2, 18) c. CD on (?2, 2), IP none d. CU on (?2, 2), CD on (??, ?2) and , IP (?2, ?18) and (2, 18)
Solve the problem.An arrow is fired straight up from the ground with an initial velocity of 
per second. Its height, 
in feet at any time t is given by the function 
Find the interval of time for which the height of the arrow is greater than 
A. before 
sec
B. before 
sec or after 
sec
C. after 
sec
D. between 
and 
sec