## TestTakingLifesaver Group Title A student scored 83 and 91 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive one year ago one year ago

1. Australopithecus Group Title

83 and 91 are the limits inclusively We can just take the average of the 3 tests, since we dont know the value of the third test it is our x value, then just place that between the limits and solve for x 85 <= (x + 83 + 91)/3 <=90 So first solve this, (x + 83 + 91)/3 <=90 then solve this, 85 <= (x + 83 + 91)/3 Then simply place the values you get into square brackets

2. TestTakingLifesaver Group Title

@Australopithecus Best Responce, thanks

3. TestTakingLifesaver Group Title

4. Australopithecus Group Title

treat it like an equality and solve for x, just remember if you multiply or divide by a negative you have to flip the inequality sign

5. Australopithecus Group Title

other than that it is just simple algebra, make an attempt at it if you get stuck I will help you

6. Australopithecus Group Title

You can use wolframalpha to check your solution as well