Before we try to solve anything, let's convert our fractions into decimals, this so if we use a calculator (or writing on paper), it will be much easier to put it. 131 1/4 = 131.25 (divide 100 by the denominator to know each 1/x value). 12 1/2 = 12.50 The formula for the area of a rectangle is L x W, or Length x Width. Since we are looking for our width, w, we need to divide by the length. 131.25 / 12.5 = 10.5. Our width is 10 1/2 ft. I hope this helps!
First get the formula for your pattern in the form of TN. Where d represents your difference and a represents your first term. Then equate the -401 to your formula and solve for n
