Oops, I dropped 40 points, can you pick it up for me?

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

Reflect the point (7,0) across the y-axis

Evaluate the expression. (9 + 5)(3 + 2)0