What is the sum of -3^2-7x+9and -5^2+6x-4

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?

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 12