SOLUTION: "In your Math Class, you have the scores of 68, 82, 87, and 89 on the forst four of five tests. To get a grade of B, the average of the first five test scores must be greater t

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: "In your Math Class, you have the scores of 68, 82, 87, and 89 on the forst four of five tests. To get a grade of B, the average of the first five test scores must be greater t      Log On


   

Question 53092: "In your Math Class, you have the scores of 68, 82, 87, and 89 on
the forst four of five tests. To get a grade of B, the average of
the first five test scores must be greater than or equal to 80 and
less than 90. Find the range of scores you need on the last test to
get a B.

Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
80%3C=%2868%2B82%2B87%2B89%2Bx%29%2F5%3C90
80%3C=%28326%2Bx%29%2F5%3C90
5%2A80%3C=%285%28326%2Bx%29%29%2F5%3C5%2A90
400%3C=326%2Bx%3C450
400-326%3C=-326%2B326%2Bx%3C450-326
74%3C=x%3C124
Interval notation:[74,124)
I guess there's no chance of getting an A without a lot of bonus points!