Solve the problem.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 8% cement should he mix with 4 bags of 18% cement to produce a mix containing 10% cement?

A. 25 bags
B. 18 bags
C. 20 bags
D. 16 bags

Answer: D

Mathematics

Find the length of the curve.The spiral r = e2?, 0 ? ? ? ?

A. (?² - 1)
B. e^4? -
C. (e^4? - 1)
D. (e^2? - 1)

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Mathematics

Use < or > for ? to write a true sentence. ?

A. < B. >

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Mathematics

Solve by completing the square. Give exact solutions. Simplify radicals and reduce.5x2 + 9x = 0

A. 0
B. ±
C. - , 0
D. , 0

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Mathematics

Multiply.6

A. -
B. - 42
C.
D.

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Mathematics