Solve the problem.From a point on a straight road, John and Fred ride bicycles in opposite directions. John rides 7 miles per hour and Fred rides 10 miles per hour. In how many hours will they be 51 miles apart?
A. 2 hours
B. Not enough information
C. 3 hours
D. 4 hours
Answer: C
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Calculate the circulation of the field F around the closed curve C.F = x2y3i + x2y3j; curve C is the counterclockwise path around the rectangle with vertices at 
(4, 2), and (0, 2)
A. 0
B. -256
C. - 
D. 
Solve.One pound of an ingredient yields 3
cups of the final product. How many pounds of this ingredient will be required by a recipe that yields 5 cups of the final product?
A. 16
lb
B. 1
lb
C. 3
lb
D. 1
lb
Estimate the sum or difference by first rounding each value to the indicated place value. Then find the actual sum or difference.231.85 + 4 + 19.782
round each to the nearest one
A. Estimate: 254; Actual: 256.632 B. Estimate: 254; Actual: 255.632 C. Estimate: 256; Actual: 255.632 D. Estimate: 256; Actual: 256.632
Find the product.(13y + x)(13y - x)
A. 169y2 + 26xy - x2 B. 169y2 - x2 C. 26y2 - x2 D. 169y2 - 26xy - x2