12. The graph of a function is a line that passes through the points (3,
17) and (6, 32). What is the
equation of this function?
A. f(x) = 6x + 32
B. f(x) = 3x + 17
C. f(x) = 5x + 2
D. f(x) = 2x + 5

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%)