The document summarizes the heat output of a hair straightener over time. It is described by three functions between 0-3.2 minutes, 3.2-8 minutes, and 8-12 minutes. The total heat output over the full 12 minutes is found to be 3224.98 hundred degree units by calculating the integrals of each function. The interval with the greatest increase in heat is found to be from 0-3.2 minutes, with a maximum increase of 218.0 degrees F per minute at 0 minutes. The heat decrease at 9.2 minutes is calculated to be 145.24 degrees F per minute by substituting into the third function.