Question in the picture

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

If g^-1(x) is the inverse of g (x) which statement must be true