Im confused what is the lcm of 7, 12 and 14

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?

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1

Question b of 10which of the following describe an angle with a vertex at a? check all that applyo a. labcов. савd dooo c_baco d. zacb