Find height of cylinder plz help thanks

Can somebody me out with this question

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

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)