Use front end rounding to estimate the sum or difference. Then find the exact answer to the problemSheri wanted to know the total number of hours she worked this week. Her time card indicated the following hours: Monday, 5.97 hours; Tuesday, 10.14 hours; Thursday, 4.63 hours. How many hours has Sheri worked?
A. Estimate: 21 hours; exact: 20.74 hours
B. Estimate: 20 hours; exact: 20.74 hours
C. Estimate: 21 hours; exact: 21.74 hours
D. Estimate: 19 hours; exact: 21.74 hours
Answer: A
Mathematics
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Use an appropriate identity to find the exact value of the expression.cos (75°)
A. 
B. 
C. 
D. - 
Mathematics
Complete.46 ft = 
yd 
ft
A. 14 yd 1 ft B. 15 yd 2 ft C. 16 yd 2 ft D. 15 yd 1 ft
Mathematics
Provide an appropriate response.Use a calculator to find sin 54° rounded to the nearest ten-thousandth.
A. -0.5588 B. -1.7896 C. 1.2361 D. 0.8090
Mathematics
Decide whether or not the set is closed under multiplication.{1, 32, 33, 34, . . .}
A. Not closed B. Closed
Mathematics