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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Solve the inequality and graph the solution set.
- 
? 
+ 3
A. 
B. 
C. 
D. 
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Use the graph to find the average rate of change.
A. - 2
B. - 
C. 
D. 2
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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}
B. 7; {
x ? 7}
C. none; (-?, ?)
D. 0; {
x ? 0}
Mathematics
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?
A) 400= 275+ 15h B) 400= 15h C) 400= 15/h +275 D) 400= -275 -15h
Mathematics