NEED HELP ASAP ALGEBRA 2

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

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?

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.