What is the sum of the series? 5∑i=1 4i

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?

If w = 6 units, x = 3 units, and y = 5 units, what is the surface area of the figure? 168 units2 240 units2 144 units2 96 units2

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11