** ** jake earns $7.50 per hour working at a local car wash. the function, ƒ(x) = 7.50x, relates the amount jake earns to the number of hours he works. write the inverse of this relation.

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%)