Please help me with number 11 and number 13 please, ASAP.

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

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?

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area