1) The expression for the perimeter of a rectangle with a length of 8 feet and perimeter of 40 feet is
40 ft = 21 + 2w
P=2(8 ft) + 2w
P = 21 + 2(8 ft)
40 ft = 2(8 ft) + 2w

Me answer number 3plz explain how you do it

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

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