document.write( "Question 1089848: Solve the modeling problem. Cell Phone Charges: A cell phone service provides communication between two cities. If x represents the number of minutes for the call, where x > 0 , then the function
\n" ); document.write( " $\"f%28x%29+=+0.75%5Bx%5D+%2B+1.50\"$ gives the total cost of the call in dollars. Find the cost of a 7.5 minute call. \n" ); document.write( "

Algebra.Com's Answer #704387 by EMStelley(208) $\"\"$ $\"About$

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We have a formula for the total cost of a call:
\n" ); document.write( " $\"f%28x%29+=+0.75x+%2B+1.50\"$
\n" ); document.write( "Remembering that x is the number of the minutes of the call, we know that a 7.5 minutes call implies that x = 7.5. So,
\n" ); document.write( " $\"f%287.5%29+=+0.75%2A7.5+%2B+1.50+=+5.625+%2B+1.50+=+7.125\"$
\n" ); document.write( "However, money does not contain a third decimal place, so we need to round to pennies, meaning that the cost of a 7.5 minute call would be $7.13. \n" ); document.write( "

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