I need help with this calculus problem!

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Which of the choices shown could be used to prove that aacp=abcp ?

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