Hiw to use number lines when rounding

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?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)