(This video starts at the 3:50 mark.) A triangular plot of land has a perimeter of 45 yards. The length of the second side is double the first side. The length of the third side is 13 yards longer than the first side. Find the length of each side. Practice Problem 1. If the sum of twice a number and three is doubled, the result is one less than five times the number. Find the number. 2. It costs $29 to become a "preferred" customer and $18 per month to receive monthly shipments of a dietary supplement. If your budget includes $200 for dietary supplements, how many months can you afford to continue receiving shipments if you sign up to be a preferred customer? Solution