Use front-end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer. Finally, find the exact answer.estimateexact 
A. Estimate: $36; exact: $31.26
B. Estimate: $36; exact: $31.34
C. Estimate: $33; exact: $31.36
D. Estimate: $36; exact: $31.36
Answer: A
Mathematics
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Solve the problem.Scores on a test are approximately normally distributed with a mean of 70 and a standard deviation of 9. The teacher wants to give A's to the top 10% of students. What is the bottom cutoff for an A grade? Round your answer to the nearest whole number.
A. 80 B. 90 C. 79 D. 82
Mathematics
Write the expression in simplest form. If a radical appears in the denominator, rationalize the denominator.
A. xy
B. xy
C. xyz
D. x
Mathematics
Write as mixed number.
A. 7
B. 7
C. 6
D. 8
Mathematics
Express as a single logarithm and, if possible, simplify.
log s + 5logx
A. log x5
B. log (x5+
)
C. log 
D. log 
Mathematics