PLEASE HELP right triangle

For what value of x does 4x = (1/8) x + 5?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

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