Find the sum.20 + (-20)

A. -40
B. 40
C. 0
D. -20

Answer: C

Mathematics

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A. - 
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C. - 
D. - 

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Find the center (h, k) and radius r of the circle with the given equation. x2 + 14x + 49 + (y - 9)2 = 64

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Find the solution set for the inequality.|x| < 1

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