Free points to whoever gets here first

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Could someone with number 1 and 2

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%)