NEED HELP ASAP PLEASE

Is the square root of 4 plus the square root of 16 rational?

If g^-1(x) is the inverse of g (x) which statement must be true

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%)