atoms of element a decay to atoms of element b with a half life of 20000 years. if there are 10000 atoms of a to begin with (and 0 atoms of b) how long will it take for there to be 2500 atoms of a

The pressure in car tires is often measured in pounds per square inch (lb/in.2), with the recommended pressure being in the range of 25 to 45 lb/in.2. suppose a tire has a pressure of 27.5 lb/in.2 . convert 27.5 lb/in.2 to its equivalent in atmospheres.