6,2,8,4,and 0 are the only possible value of the ones digit, because
6*1=6, last digit is 6
6*2=12, last digit is 2
6*3=18, last digit is 8
6*4=24, last digit is 4
6*5=30, last digit is 0
6*6=36, last digit is 6
and the whole cycle goes over again.
Selection D) is appropriate.
The triangles are congruent by SSA, given the angle is a right angle, not ASA or AA. YX is not congruent to UW, so C) is incorrect.
5 + (8*y) = h
This was the best I could think of, please let me know if I'm wrong.