anonymous
  • anonymous
The average of Jim's two test scores must be at least 90 to make an A in the class. Jim got a 95 on his first test. What grades can Jim get on his second test to make an A in the class? Jim's score must be at least
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
To take the average you add the two scores and divide by how many scores you added. The first test is 95 The second test is x because it is unknown We are averaging two tests. We need a 90 as an average. So \[\frac{ 95 + x }{ 2 } = 90\] Solve for x. That will be the score Jim needs
horsegirl27
  • horsegirl27
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anonymous
  • anonymous
okay so average is total sum over number of points of information so the average sum/number=90 sum = (95+B)/2=90 95+B=180 180-95+B B=85

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anonymous
  • anonymous
at least 85
anonymous
  • anonymous
because if you get a bigger test number for the second test, you get a higher average
anonymous
  • anonymous
medal me please
anonymous
  • anonymous
https://www.youtube.com/watch?v=95h7qAkz5QY Use x to represent the 2nd test, than solve by replacing numbers for x which would make the given equation true.

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