coming.home
  • coming.home
I'm having a really hard time figuring out where to start for this problem. Alex purchased a 6-hour calling card. He has used t minutes of access time. Write an algebraic expressions to represent how many minutes he has remaining and identify units for the expression. Where do I even start for this one? Also what do they mean by "identify the units"?
Algebra
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
The unit your answer will be in is a unit of time, so either hours or minutes. He has a 6 hour calling card, and he has used t minutes. You're not going to want to work with them if they're in different units, so convert 6 hours to minutes, or t minutes to hours (you choose which one you want to convert to, that's why it says to specify). Let's convert the 6 hours to minutes. We know that there are 60 minutes in an hour, so 6*60 gives us 360 minutes on his calling card. Each minute he uses (t) is subtracted from the total minutes he has (360), so your expression is 360 - t minutes. *The "minutes" is important because it is the unit we chose.
coming.home
  • coming.home
Ohhhh okay that makes sense. So for future reference I should probably convert my problem to have the same units to avoid confusion right?
Plasmataco
  • Plasmataco
Definately

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