Area of the rectangular yard = 96 square feet Let us assume the length of the yard = x feet Width of the yard = x - 4 feet Then Area of the yard = length * width 96 = x(x - 4) 96 = x^2 - 4x x^2 - 4x - 96 = 0 x^2 - 12x + 8x - 96 = 0 x(x - 12) +8(x - 12) = 0 (x - 12)(x + 8) = 0 As the value of length cannot be negative so x - 12 = 0 x = 12 So Length of the yard = 12 feet Width of the yard = x - 4 feet = 12 - 4 feet = 8 feet Then Perimeter of the yard = 2 (length + width) = 2(12 + 8) = 2 * 20 feet = 40 feet. So the perimeter of the yard is 40 feet.
You have to add all of the values and divide them by the number of values. In this case you would do 30,000 + 50,000 + 30,000 + 80,000 + 70,000 which equals 260,000 then you would divide that number by 5 since there are 5 values.
