Mike bought 3 gallons of orange juice to make fruit punch for a party. he used 9 quarts of the orange juice.

how many quarts of orange juice were left?
(1 gallon = 4 quarts)

Anyone know? will mark brainliest if correct

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.