1 This generally includes replacing a few parts like hoses, sensors, or either the compressor or condenser. 2  CostHelper readers report paying $171-$727 for minor air conditioning repairs, at an average cost of $488. 3  Extensive auto air conditioning repairs can cost $1,000-$4,000 or more, depending on make and model.
Their numerical system is similar to that of the Romans, but instead of Xâs and Iâs they use dots, bars and shells. Each dot has the value of one, each bar the value of five, and each shell the value of zero. This brings us to the main mathematical contribution of the Mayans, the concept of zero.
The Mayans invented writing and they made great advances in astronomy and mathematics. Mayan civilization was at its peak from 600 AD to 900 AD. However after 900 AD it declined.