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.
Your performance on these four parts will be compiled and weighed to determine your AP Exam score. Section I 1  : Part A: Multiple Choice (55 questions; 55 Minutes; 40% of total exam score). 2  Part B: Short-answer questions (4 questions; 50 minutes; 20% of total exam score).