PLeAsE do this!! In five minutes it's due. The area of a rectangular garden is 21x²-8x-4. Factor completely to find the dimensions of the box.(So find the length and 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%)