Express the number in scientific notation.2500
A. 2.5 × 10-2
B. 2.5 × 10-3
C. 2.5 × 103
D. 2.5 × 102
Answer: C
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Find the indicated matrix.Let A = 
. Find 3A.
A. 
B. 
C. 
D. 
Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
dollars. The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $270.00?
A. {x ? 20 < x < 28} B. {x ? 18 < x < 30} C. {x ? 24 < x < 36} D. {x ? 19 < x < 29}
Find the inverse of the invertible matrix.
A. 
B. 
C. 
D. 
A tractor pulls a log 900 meters, and the tension in the cable connecting the tractor and log is approximately 16,691 newtons. The direction of the force is 
above the horizontal. Approximate the work done in pulling the log.
?
(Round the answer to two decimal places.)
?
A. 12,305,260.09 N-m B. 12,305,220.09 N-m C. 12,305,300.09 N-m D. 12,305,280.090 N-m E. 12,305,240.09 N-m