If you are currently using a gas or electric pool heater, the savings from solar pool heating system will pay for itself in 2-3 years of installation. For example, the average system costs about $5,500 and it typically costs about $2,000 a year to heat a pool with gas.
In the United States, enrollment in AP Statistics classes has increased at a higher rate than in any other AP class. Students may receive college credit or upper-level college course placement upon the successful completion of a three-hour exam ordinarily administered in May.
  AP classes are college-level, and if you get a decent grade on the AP exam in May you could earn college credits.   Honors classes are just an advanced version of the â¦ College Prep classes.They are not as hard or time-consuming as AP classes, but they still are hard. AP classes are college-level, and if you get a decent grade on the AP exam in May you could earn college credits.   Honors classes are just an advanced version of the â¦ College Prep classes.