Is it correct did i do it right plz

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?

20 only answer if 100% sure most high school-aged teens are very active. a. true b. false

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1