I’m getting 9.8 not sure what I’m doing wrong

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?

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1