Enrique drank 2 3/16 cups of coffee in 2 1/2 hours. How much coffee did he drink each hour?
2 answers:
Remark
This is sort of like a problem using d=r*t. The formula would be somewhat the same.
Givens
t = 2 1/2 hours
C = Cups of coffee = 2 3/16
R = ??
Formula
C = R * T
Solution
2 3/16 = R * 2 1/2 Change to decimals
2.1875 = R * 2.5 Divide both sides by 2.5
R = 2.1875 / 2.5
R = 0.875 cups / hour
That's the same thing as 7/8 cup (just run through the answers with a calculator if you are not sure where that comes from).
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Hi here is your answer
an=5n-3
an-1= -3+5n
an-1= -3+5(n-1)
an-1= -3+5n-5
an-1= 5n-7
d= an- an-1
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d=4
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