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elena-14-01-66 [18.8K]
3 years ago
12

My friend and I have different calling plans. Mine has a monthly fee of $10 and $0.08 per minute charge. My friend pays $0.06 a

minute and a $15 monthly customer fee.
After how many minutes will our plans cost the same amount? Round your answer to the nearest minute.
Mathematics
1 answer:
loris [4]3 years ago
7 0

difference is monthly customer fee= 15-10 = $5

difference in minutely charge = 0.08-0.06 = $0.02

minutes it takes for plans to cost same amount= 5÷0.02 = 250 min

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vampirchik [111]

Answer:

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Step-by-step explanation:

To solve proportions you cross-multiply.

\frac{2}{y-4} =\frac{y+3}{4} \rightarrow 2\times4 = (y-4)\times(y+3) \rightarrow 8=y^2-y-12

Now that we have 8 = y^2 - y - 12, we must make the entire trinomial equal to 0 by subtracting 8 from both sides.

y^2 - y - 20 = 0

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Make both factors equal to 0 to solve for both values of y.

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Step-by-step explanation:

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Hi,

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Have a great day!

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