anonymous
  • anonymous
Karen makes $5 per hour for babysitting and $12 per hour giving music lessons. One week she worked a total of 18 hours and made 139$ that day. How many hours did she spend babysitting ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
you need to use a system of equations b= babysitting m= music lessons
anonymous
  • anonymous
we know she worked 18 hours, so.... b+m=18
anonymous
  • anonymous
we know how much she gets paid for each, and what she made... 12 for m 5 for b so.... 139=5b+12m

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anonymous
  • anonymous
solve b+m=18 for either b or m... we'll choose b b=18-m
anonymous
  • anonymous
substitute that in for the second equation, 139=5b+12m b=18-m 139=5(18-m)+12m
anonymous
  • anonymous
139=90-5m+12m 49=7m m=7
anonymous
  • anonymous
since we know m... we can plug that into the easier equation, b+m=18 b+7=18 b=11
anonymous
  • anonymous
so, since b=11 and m=7, we know that she babysat for 11 hours and gave music lessons for 7 hours
anonymous
  • anonymous
thanks ! i gotcha now.
anonymous
  • anonymous
cool, good luck
anonymous
  • anonymous
Chris put 1,500 $ in a savings account at an annual interest rate of 5%. If Chris does not deposit or withdraw any money, what is the amount of interest Chris will earn the first year her money is in the savings account ?

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