Which of the following is the preferable method to compute the following problem?
45.6 - 31.5
?
A. ?compatible numbers
B. ?compensation
C. ?rounding decimals
D. ?front-end rounding
E. ?rounding the first number up and the second number down
Answer: B
Mathematics
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Simplify.8.7 - 7.9 ÷ 2.5 ? (4.5 - 4.7)2
A. 0.0128 B. 8.5736 C. -70.3 D. 8
Mathematics
Find the missing value. Round money to the nearest cent, rate to the nearest tenth of a percent, and time to the nearest month.Principal: $6210Interest: $812.17Rate: 
Time: 11 months
A. 14.1% B. 14.3% C. 15.7% D. 13.1%
Mathematics
A point on the terminal side of angle ? is given. Find the exact value of the indicated trigonometric function.
?Find sec ?.
A. - 
B. 
C. -1
D. -
Mathematics
Simplify the expression. Use positive exponents. Assume variables represent nonzero real numbers.(-2p)6 (-2p)4
A. 210p10 B. 210p C. 4p10 D. -210p10
Mathematics