A building in a city has a rectangular base. The length of the base measures 60ft less than twice the width. The perimeter of the base is 900ft. What are the dimensions of the base?

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

d

because parallelagram have all 4 angels the same size dependeing and a rectangle and square are oth parallelogram