Kat gets a 95% on her first math test and an 80% on her second math test. If she wants an average grade of at least 90% in her math class, what does she need to get on her third final math test?
Define a variable ** Let x = the percent needed on her third math test
Write an equation ** (95 + 80 + x)/3 = 90
Combine like terms ** (95 + 80 + x) = 270
Subtract 95 and 80 ** x = 270 - 95 - 80
Divide by 3 ** x = <<95=95>>95
#### 95