Solve the problem.A bacterial culture has an initial population of 10,000. If its population declines to 7000 in 2 hours, when will its population be 4900? Assume that the population decreases according to the exponential model.
A. after 9 hr
B. after 5 hr
C. after 7 hr
D. after 4 hr
Answer: D
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Find the probability.In a test for a certain disease, 180 out of 200 people test negative. Find the probability that a randomly chosen person tests positive.
A. 
B. 
C. 
D. 
Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
A. 9
+ 45
B. 9
- 45
C. 9
- 5
D. 
Use the apportionment criterion to decide who should get an additional representative if another member is added to the total number of representatives.The Artist's Association has 7 representatives from the Painter's Group, which has 200 members, and 8 representatives from the Sculptor's Association, which has 480 members.
A. Painter's Group B. Sculptor's Association
Solve the problem.A carpeted living room and dining room area measures 36 ft by 10 ft. Mark decides to install wood flooring in the 
by 
dining room. By what percent has he reduced the area that is carpeted?
A. 10% B. 66.7% C. 33.3% D. 50%