It’s going in a pattern I’m not doing it

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

Y= a(x-3)squared-1 what is the value of a

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question