An expression for the area of a rectangular piece of sheet metal is X^2+8x+12. An expression for the length of the same piece of sheet metal is x+6.
Determine an expression for the width.

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%)