To clean a tank, 3/4 cup of disinfectant is needed for every 2 gallons of water. how many cups of disinfectant are needed for 20 gallons of water?

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Factor the polynomial. b^2 + 4b + 4

Write a similarity statement for the similar triangles. afgh ~ a