First estimate the answer. Then add or subtract to find the exact answer. Write answer as a mixed number. 

A. Estimate: -2; Exact: - 2
B. Estimate: -3; Exact: 8
C. Estimate: -3; Exact: - 2
D. Estimate: -2; Exact: - 2

Answer: C

Mathematics

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A. Yes; no B. No; no C. Yes; yes D. No; yes

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Solve the given differential equation. (The form of yp is given.)D2y + 49y = 9 sin 7x (Let yp = Ax sin 7x + Bx cos 7x.)

A. y = c1 sin 7x + c2 cos 7x + x cos 7x
B. y = c1 sin 7x + c2 cos 7x - x sin 7x + x cos 7x
C. y = c1 sin 7x + c2 cos 7x - x sin 7x
D. y = c1 sin 7x + c2 cos 7x - x cos 7x

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Find the real solutions of the equation. = 3

A. {3} 
B. {9} 
C.
D.

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Solve the problem.Which of the two rates would yield the larger amount in 1 year: 9% compounded monthly or 9% compounded annually?

A. 9% compounded annually
B. 9% compounded monthly
C. They will yield the same amount.

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Mathematics