What value, a, needs to be added to create a perfect-square quadratic?
x² - 6x + a

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Which system of linear inequalities is represented by the graph?

Aladder that is 20 ft. long against the side of a building. f the angle formed between the ladder and the ground is 75 degrees, how far is the bottom of the ladder from the base of the building?