Aplayground has three different playing areas: a square area for a swing set, a rectangular area for a slide, and an area of 30 square feet for a basketball hoop. the following expression represents the total area of a rectangular playground, and x represents side length of the area with the swing set.
x^2 + 11x + 30
1. what does the term x^2 in the expression represent?
2. what does 11x in the expression represent?
3. what does the numeral 30 in the expression represent?