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.
The length of time for testing depends on how many parts of the test you need. The parts you need to take depend on your program of study. The English part of the test includes 50 Multiple Choice questions and an Essay. This part is taking students about 1.5-2.5 hours to complete.