What the answer to this ?

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

Bring the fraction a/a-4 to a denominator of 16-a^2

If f(x) = -5x + 1 and g(x) = x3, what is (gºf)(0)? enter the correct answer