Rob has a gift card for $50, so far he has selected a shirt for $32 write and solve an inequality to determine the additional amount rob could spend without exceeding the gift card limit

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%)