How much of a radioactive kind of iodine will be left after 180 days if you start with 160 grams and the half-life is 60 days?

Which equation requires the division property of equality to be solved?

Which term best describes the association between variables a and b

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?