The measurement of radioactive decay can be useful tool in things such as carbon-dating. for a carbon sample with mass 500kg and a half life of 5,730 years, calculate the remaining mass after 20,000years.

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

Charlie tosses five coins. what is the probability that all five coins will land tails up.