Factor by grouping.2s2 + 10s - as - 5a

A. (s - a)(2s + 5)
B. (s + 2)(5s - a)
C. (s - 5)(2s + a)
D. (s + 5)(2s - a)


Answer: D

Mathematics

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Find the foci of the ellipse whose equation is given. +  = 1

A. foci at (- , -1) and (, -1)
B. foci at (1 + , 1) and (1 - , 1)
C. foci at (-1 + , 1) and (-1 - , 1)
D. foci at (1 + , -1) and (1 - , -1)

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Remove or add parentheses as indicated.Place parentheses to make the equation  true.

A. None needed. B. a ? (b ÷ b + 5b) = a + 5b C. (a ? b) ÷ (b + 5b) = a + 5b D. a ? b ÷ (b + 5b) = a + 5b

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Solve the problem.A game involves choosing 7 numbers from the numbers 1 through 13. In how many ways can this be done?

A. 1724 B. 8,648,640 C. 1696 D. 1716

Mathematics

Provide an appropriate response.Explain why  ? A when A is negative.

What will be an ideal response?

Mathematics