What is the percent of decrease from 400 to 60

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?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Binh says the point of intersections is (0,-3) which statements identify the errors binh made , check all that apply