Find the difference.a + b, for a = 1 and b = -2

A. 3
B. 1
C. -1
D. -3


Answer: C

Mathematics

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Convert as indicated.20 L to gallons

A. 4.7 gal B. 5.3 gal C. 21.2 gal D. 9.0 gal

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Solve using the percentage formula.What percent of 40 is 32?

A. 80% B. 120% C. 125% D. 75%

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Using a calculator, evaluate the trigonometric functions. Round to four significant digits.cos 689°

A. -0.5150 B. 0.9998 C. 0.4848 D. 0.8572

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Provide an appropriate response.Estimating your answer, in a subtraction problem, is not as advantageous as in an addition problem and should be avoided.

A. True B. False

Mathematics