PLEASE HELP! GIVING POINTS :)!

Combine like terms to make a simpler expression 3z+z

Heather is writing a quadratic function that represents a parabola that touches but does not cross the x-axis at x = -6. which function could heather be writing? fx) = x2 + 36x + 12 = x2 - 36x - 12 f(x) = -x + 12x + 36 f(x) = -x? - 12x - 36

Percent increase and decrease. original number: 45 new number: 18