Express the sum in sigma notation.1 - 2 + 4 - 8 + 16

A. 2^k
B.
C. 2^k
D. 2^{k + 1}

Answer: A

Mathematics

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Solve the problem.The perimeter of a rectangle is six times the width. If the length were increased by 4 inches and the width were increased by 7 inches, then the perimeter would be 160 inches. What is the width?

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Graph the inequality.2 ? x < 6

A.
B.
C.
D.

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B.
C.
D.

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