Work the problem. Give the answer in scientific notation, rounded to two decimal places, unless otherwise indicated.Assume that the volume of the earth is 4.98 × 1014 cubic meters and the volume of a bacterium is 
cubic meters. If the earth could be filled with bacteria, how many would it contain?
A. 2.00 × 1030 bacteria
B. 5.00 × 1031 bacteria
C. 5.00 × 10-31 bacteria
D. 2.00 × 10-30 bacteria
Answer: A
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Multiply and simplify.
? 
A. 1
B. 
C. -1
D. 0
Solve the problem.The mean air temperature T, in F°, at Fairbanks, Alaska, on the nth day of the year, 
is approximated by: 
Find the temperature at Fairbanks on day 176, to the nearest tenth.
A. 90.9° F B. 60.6° F C. 56.1° F D. 57.6° F
Identify the type of sampling described by the proposal.An education researcher randomly selects 60 of the nation's junior colleges and interviews all of the professors at each school.
A. convenience sample B. systematic sample C. simple random sample D. cluster sample sample E. stratified sample
Find the indicated matrix.Let A = 
and B = 
. Find A - B.
A. 
B. 
C. 
D. 