kenni

Two Questions: 1) A certain radioactive isotope has leaked into a small stream. 100 days later after the leak 10% of the original amount of the substance. Determine the half-life of this radioactive isotope. 2) During a research experiment, it was found t...

im sorry but im still confuse i have 8 other problems that are similar to this. if you just show me how to do these, i can figure out the rest of my hw. please.how to find the halflife?