Evaluate the expression (y^2-4x)-7-4 for x=4 and y=5
a. -1
b.3
c.7
d.-7 .

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%)