SOLUTION: Your test scores in Environmental Science are 77% and 81%. You have one more test left. At this point, you are working hard to earn at least a B-. Define the variables and write an

Algebra ->  Inequalities -> SOLUTION: Your test scores in Environmental Science are 77% and 81%. You have one more test left. At this point, you are working hard to earn at least a B-. Define the variables and write an      Log On


   



Question 1027719: Your test scores in Environmental Science are 77% and 81%. You have one more test left. At this point, you are working hard to earn at least a B-. Define the variables and write an inequality representing the possible scores you can earn on your next test to have an average between 80% and 83%, inclusive.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let X = score on the third test.
==> The average of the three scores is %2877%2B81%2BX%29%2F3.
By hypothesis, you want 80+%3C=+%2877%2B81%2BX%29%2F3+%3C=+83.
==> 240+%3C=+77%2B81%2BX+%3C=+249
==> 82+%3C=+X+%3C=+91.