When rewriting y 2x+1 in function notation, what do you replace with fx)?

What is the missing constant term in the perfect square that starts with x^2 -20x

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

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%)