What is -4 - 4/3 in a fraction

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

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?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.