if the average ( arithmetic mean ) of x + 2 , x + 3 , and x + 4 is 0 , then x =
"( x + 2 + x + 3 + x + 4 ) / 3 = 0 = > 3 x + 9 = 0 = > x = - 3 answer b"
subtract(multiply(3, const_2), multiply(2, const_2))