What is the length of each side of a square room if the area is 400 ft²?

Icould really use some with this question.

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

]supplementary angles are two angles that add up to . • complementary angles are two angles that add up to degrees. • adjacent angles share a and a • congruent angles have the measure. • an triangle has one angle that is greater than 90 degrees. • a triangle with angles 45°, 45°, and 90° would be a triangle