Solve the problem.For a culture of 70,000 bacteria of a certain strain, the number of bacteria N that will survive x hours is modeled by the formula N = 7000
. After how many hours will 21,000 bacteria survive?
A. 97 hr
B. 91 hr
C. 9 hr
D. 79 hr
Answer: B
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Determine whether the integral converges or diverges.
A. diverges, 
? 
for x ? 7, 
diverges
B. diverges, 
? 
for x ? 7, 
diverges
C. converges, 
? 
for x ? 7, 
converges
D. converges, 
? 
for x ? 7, 
converges
True or false?In Fremont in 1990, the mayor's approval rating was 80%. In 1998, his approval rating was only 
True or false? in absolute terms his approval rating decreased by 20 percentage points whereas in relative terms, it decreased by 
A. True B. False
Solve the problem.Julie and Eric row their boat (at a constant speed) 48 miles downstream for 6 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 8 hours. Find the rate of the current.
A. 1 mph B. 2 mph C. 7 mph D. 0.5 mph
Solve the equation on the interval 0 ? ? < 2?.3 cot2 ? - 4 csc ? = 1
A. 
B. 
C. 
D. 