Help with a math assignment 5

Can someone me with the property questions for 12 13 and 14 plz

If f(x) = 4 - x2 and g(x) = 6x, which expression is equivalent to (g-f)(3)? 06-3-(4 + 3)2 06-3-(4-33 6(3) - 4 +32 6(3) -4 -32

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.