Is 25/45 and 15/27 proportional? show your work. (ratios)

15 points ! ~ see if you know the answer to both you!

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?

Which of the following expressions is equal to 2x^2+8