( 27 − 9 ) × 3 ÷ 9 + 18 = 42 .

Factor a^3 - 3 + 3a^2 - a. a) (a - 1)(a + 1)(a + 3) b) (a^2 + 1)(a - 3) c) (a^2 - 3)(a + 1

F(x) = (x^2 + 3x − 4) and g (x) = (x+4) find f/g and state the domain.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.