The AMC 10 is a 25-question, 75-minute, multiple choice examination in secondary school mathematics containing problems which can be understood and solved with algebra and geometry concepts. The AMC 12 is a 25-question, 75-minute, multiple choice examination in secondary school mathematics containing problems which can be understood and solved with pre-calculus concepts. Two different versions of the contests are given on two dates, about two weeks apart, in February. Each AMC 10 and AMC 12 contest contain about 12 of the same math problems.
The sizes 10 and 12 inches typically refer to blades in reference to table saws. But the designation also applies to differences in physical sizes, framework, power consumption and capabilities. For most weekend woodworkers, the 10-inch saw works fine. It's lighter than the 12-inch saw, which often has a heavier cast iron table. Most 10-inch saws run on 110 power supply which makes it easy to plug in wherever needed. The 12-inch saw typically requires 220 volts. If your garage or shop isn't wired for it, an electrician is required to install the outlet for you. The 10-inch saw is considerably less expensive than the 12-inch saw, with more options concerning style, affordability and availability. Most 12-inch saws are used more often industrially, while 10-inch machines are typically targeted at the consumer or small cabinet shop.