Solve the problem.Two pipes together can fill a large tank in 10 hr. One of the pipes, used alone, takes 15 hr longer than the other to fill the tank. How long would each pipe take to fill the tank alone?
A. 10 hr; 25 hr
B. 15 hr; 30 hr
C. 25 hr; 40 hr
D. 12.5 hr; 27.5 hr
Answer: B
Mathematics
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A. - 
B. - 
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A. y = ± 
B. x = ± 
C. x = ± 
D. y = ± 
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What percent of people in the chart in number 7 have a blood pressure between 120 and 159?
A. 30% B. 0.3% C. 3.3% D. you cannot combine the frequencies to find out
Mathematics
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What will be an ideal response?
Mathematics