Graph the solution set of the system of inequalities or indicate that the system has no solution.x2 + y2 ? 81x2 + y2 ? 16

A.

B.

C.

D. no solution

Answer: A

Mathematics

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Use dimensional analysis to convert the units. If necessary, round to the nearest tenth. 5 hr =  sec

A. 300 B. 4500 C. 9000 D. 18,000

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Evaluate using integration by parts.dx

A. x2(x2 + 8)3/2 + (x2 + 8)5/2 + C
B. 2x2(x2 + 8)3/2 - 2(x2 + 8)5/2 + C
C. x2(x2 + 8)3/2 - (x2 + 8)5/2 + C
D. x(x2 + 8)3/2 - (x2 + 8)7/2 + C

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Mathematics

If n is an integer, n ? 180° represents an integer multiple of 180°, and  represents an odd integer multiple of 90°. Decide whether the expression is equal to 0, 1, -1, or is undefined. cot(n ? 180°)

A. 0 B. 1 C. -1 D. Undefined

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Mathematics

Divide, if possible.

A. -4
B. 4
C. -  
D. -14

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Mathematics