X-7=-2x-5 can someone me with the steps

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?

Which of the following is a function? a.) {(-2, -4/5), (-1,-,,-1)} b.) {(-2,,1/,3/,1)} c.) {(-22)} d.) {(-21)}

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?