PLSS HELP ME ITS DUE IN 20 MINSS

What is this equation in point-slope form?

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?

Use set buikder notation to represent the following set: {, -2, -1, 0}