Evaluate bc for a=5 b=-2 c=4 and d=-6

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?

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2