Element X decays radioactively with a half life of 7 minutes. If there are 340 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 3 grams?

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.