How to do s=3f-24 solve the formula fo f and plzz show how you got it

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?

When the ball has traveled a distance of

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36