25. A volume of 1 cubic foot contains about 7 1/2 gallons. How many cubic feet of oil will a cooling tank hold if it contains 1.776 1/2gallons?

If possible could you guys help with 21 and 23 too thanks

Solve the problem. a student earned grades of c, a, b, and a in four different courses. those courses had these corresponding numbers of credit hours: 4, 5, 1, and 5. the grading system assigns quality points to letter grades as follows: a = 4, b = 3, c = 2, d = 1, and f = 0. compute the grade point average (gpa) and round the result to two decimal places. 3.40 3.50 8.75 2.18

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

The radius of a sphere is 3 inches. which represents the volume of the sphere?