Find a formula for the expression. Use sigma notation.

A. xⁿy^-1 + x^n-ky^k-1
B. + xⁿy^-1 + x^n-ky^k-1
C. xⁿy^-1 + x^n-ky^k-1
D. xⁿy^-1 + x^n-ky^k

Answer: C

Mathematics

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A. -4
B. 0
C. -
D. no slope

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Use a quantifier to make the following true or false, as indicated, where x is a natural number.12x = 5x + 7x (make false)

A. More than one natural number x exists such that 12x = 5x + 7x. B. For every natural number x, 12x = 5x + 7x. C. There exists a natural number x such that 12x = 5x + 7x. D. There is no natural number x such that 12x = 5x + 7x.

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Use a graphing calculator to solve the equation. Round to two decimal places. = 5

A. -0.6 B. 0.6 C. 1.4 D. -1.4

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Compute.-(-(-21))

A.
B. 0
C. 21
D. -21

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