Solve the problem.A merchant has coffee worth $4 a pound that she wishes to mix with 7 pounds of coffee worth $7 a pound to get a mixture that can be sold for $5 a pound. How many pounds of the $4 coffee should be used?

A. 7 lb
B. 14 lb
C. 21 lb
D. 10.5 lb


Answer: B

Mathematics

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A.

B.

C.

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A. - 2
B. - 
C.
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Find all numbers that are not in the domain of the function. Then give the domain using set notation.f(x) = 

A. 3; { x ? 3}
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Jane earns $25 per hour babysitting. If she starts with $275 in her bank account, which equation represents how many hours (h) she will have to babysit for her account to reach $400?

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Mathematics