Solve the quadratic function using factoring. Your answer should be in the following format: x=_,x=_ (after the equal sign is where the solution should go) There are no spaces. x^2+10x+9x
2
+10x+9

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)