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anonymous
 5 years ago
when making a long distance call from a cetain pay phone, the first three minutes of a call cost $2.25. After that, each additional minute or portion of a minute of that call costs $0.30. Using the inequality C is greater than or equal to 2.25+0.30(X3)where C is the total cost and X is the number of minutes, find the number of minutes one can call long distance for $4.35. Please show the work so i can do it.
anonymous
 5 years ago
when making a long distance call from a cetain pay phone, the first three minutes of a call cost $2.25. After that, each additional minute or portion of a minute of that call costs $0.30. Using the inequality C is greater than or equal to 2.25+0.30(X3)where C is the total cost and X is the number of minutes, find the number of minutes one can call long distance for $4.35. Please show the work so i can do it.

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0^^please help me on this assignment. Please show the work so i can know how to do it. Thanks

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well you already have the equation: C=2.25+0.30(X3).. that means you can get the cost for known number of minutes and vice versa

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so just substitute for C=4.35 (the cost) to get the number of minutes, that's: 4.35=2.25+0.30(X3).. just solve the equation for X.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[4.35=2.25+0.30(X3) \implies 0.30(X3)=4.352.25\] \[\implies 0.30(X3)=2.1 \implies X3=7 \implies X=10\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.010 minutes is the answer you're looking for :)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0does that make sense to you?
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