SOLUTION: Stephanie has the following scores on her algebra tests: 85, 92, and 71. What score must she earn on her fourth test in order to have an average of 80 or above? Please show the alg

Algebra ->  Quadratic-relations-and-conic-sections -> SOLUTION: Stephanie has the following scores on her algebra tests: 85, 92, and 71. What score must she earn on her fourth test in order to have an average of 80 or above? Please show the alg      Log On


   

Question 443607: Stephanie has the following scores on her algebra tests: 85, 92, and 71. What score must she earn on her fourth test in order to have an average of 80 or above? Please show the algebraic inequality you used and show all of your work. Please show the algebraic inequality you used and show all of your work.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(85+92+71+x)/4=80
248+x=320
x=320-248
x=72