# Math

A phone company uses the equation y=0.15x+10 to find y, the monthly charges for a customer sending x text messages. How many text messages are sent if the monthly charge is \$77.50?

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1. y=0.15x+10

77.50 = 0.15x + 10

76.50 = 0.15x

? = x

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Ms. Sue
2. 21?

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3. No.

76.50 divided by 0.15 = ?

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Ms. Sue
4. It is 510!!!...

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5. it's 21 (i think idk)

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7. 506 idk

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8. The answer is 21 because 77.50x0.15=11.625 then you add the ten which equals 21.

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