Can someone explain 12-15? i was absent for a while so i m behind. you.

12. the reflexive property of congruence means anything is congruent to itself
13. the transitive property of equality means if 2 things are equal to the same other thing then they are equal to each other
14. Symmetric property of equality means that you can change the order of the equation
15. That's the transitive property of congruence its basically the same as 13 but with segments instead of the measure of angles.

1 is 5 1/4 and the rest I didnt really get, but I tried on 5 and I think it is 5x