How do i get rid of this account?

We have enough material to build a fence around a station that has a perimeter of 180 feet the width of the rectangular space must be 3 1/4 feet what must the length be

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

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64