Please help quickly

Which situation could be represented using the following expression?

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?

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

What is the number 321,000,000 in scientific notation? also what is the number? ?