Use the laws of exponents to simplify each expression using positive exponents only. Assume all variables represent nonzero real numbers.(x-6)-3
A. 
B. x18
C. -x9
D. 
Answer: B
Mathematics
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What was the increase in sales between month 5 and month 6 of 2007?
A. $800 B. $8000 C. $4 D. $4000
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Find the center and radius of the circle.y2 = 81 - (x - 4)2
A. Center: (0, -4); radius: 9 B. Center: (-4, 0); radius: 81 C. Center: (0, 4); radius: 81 D. Center: (4, 0); radius: 9
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Factor completely.y2 - 81
A. (y - 9)(y - 9) B. (y + 81)(y - 81) C. (y2 + 9)(y2 - 9) D. (y + 9)(y - 9)
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Find the perimeter of the figure.
A. 31 mi B. 62 mi C. 41 mi D. not enough information given
Mathematics