First, use front end rounding to estimate each answer. Then find the exact answer.21 + 

What will be an ideal response?


Estimate: 20 - 90 = -70
Exact: 21 - 89 = -68

Mathematics

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Evaluate the factorial expression.

A. 720 B. 10 C. 1 D. 5040

Mathematics

Use a formula to solve the problem.What is the perimeter of a rectangle of length 15 ft and width 13 ft?

A. 56 ft B. 112 ft C. 28 ft D. 43 ft

Mathematics

Rewrite the equation in the form y = A sin (x + ?). Round ? to three decimal places.y = 12 sin x + 16 cos x

A. 20 sin (x - 0.927) B. 20 sin (x + 0.927) C. 20 sin (x + 1.568) D. 20 sin (x - 1.568)

Mathematics

Find the common difference for the arithmetic sequence.2, 1, 0, -1, ...

A. -1 B. -2.6 C. -3 D. -2

Mathematics