Decide whether the following survey example would produce valid or biased results. Example: A survey is conducted to find out the average amount of money a family in this county spends on heating each month. Residents are asked to call a toll free number to share their responses.

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?