Simplify 13 – 8x – 10 + 5x
a. 1
b. 3 – 3x
c. 3 – 2x
d. 2x – 3
15 points

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%)