Question

The width of a rectangle is 13 centimeters. Let x represent the length. Find all possible values for x is the perimeter is at least 228 centimeters

Answer 1

The formula for the perimeter is ...
  perimeter = 2*(length + width)

Substituting the given values, we have
  228 cm ≤ 2*(x + 13 cm)
  228 cm ≤ 2x +26 cm
  202 cm ≤ 2x
  101 cm ≤ x

x may be any value 101 cm or greater