Algebra

posted by Tricia

A student scores 83 and 91 on her first 2 tests. Write and solve a compound inequality to find the possible values for a 3rd test score that would giver her an average between 85 and 90 inclusive.

I know she has to score between 81 & 96 but I'm not sure how to show it the proper form.

1. Steve

3*85 <= 83+91+x <= 3*90
255 <= 174+x <= 270
81 <= x <= 96

2. :/

thx steve

3. Ms sue

wow

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