I need help on 1 and 2

Sadie computes the perimeter of a rectangle by adding the length, l, and width, w, and doubling this sum. eric computes the perimeter of a rectangle by doubling the length, l, doubling the width, w, and adding the doubled amounts. write an equation for sadie’s way of calculating the

Which of the following expressions are equivalent ?

Find the roots of the equation below. x^2 - 6 + 9 = 0