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: $63; exact: $64.46
B. Estimate: $53; exact: $54.45
C. Estimate: $53; exact: $54.35
D. Estimate: $63; exact: $63.36
Answer: C
Mathematics
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Add. -1 + 4
A. -3 B. -5 C. 3 D. 5
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Solve the problem.The information in the chart gives the salary of a person for the stated years. Model the data with a linear equation using the points 
and 
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Find the exact value of the expression.cos-1 (-1)
A. 0
B. ?
C. 2?
D. 
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