~Help please and ty~ ✨Brainilist✨

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?

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.