First round each number to one non-zero digit. Then perform the calculation using the rounded numbers to obtain an estimate.6.327 × 8.09
A. estimate: 51
B. estimate: 480
C. estimate: 48
D. estimate: 4.8
Answer: C
Mathematics
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=
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Find the exact value of the following expression without using a calculator.cos 
A. - 
B. 1
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D. 
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A. 
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