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.
Best Answer: 95% of the time, Pre AP refers to your language arts course. It's supposed to prepare you to enter AP (Advanced Placement) Literature the following year. After taking Pre AP and passing, you're basically offered, and generally expected, to then take AP Lit. It's a right of passage. :D.