WILL MARK CORRECT ANSWERS BRAINLIEST! MATH PLEASE HELP DUE TODAY ASAP!!!

The parabola opens: y=√x-4 (principal square root) up down right left

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?