The cost of a service call to fix a washing machine can be expressed by the linear function Y = 45x+35, where y represents th total cost and x represents the number of hours it takes to fix the machine. What does the y-intercept represent?

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%)