Cuanto es 2+2 3+3 5×5?

If lmn=xyz, which congruences are true by cpctc? check all that apply

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.