One hundred grams of radium are stored in a container. the amount r of radium present after t years can modeled by r=10e^-0.00043t. after how many years will only 5 grams of radium be present? round your answer to the nearest whole year.

On their way home from school. terri and evie started walking out for two blocks and then running for three blocks and then repeating that pattern. if they can walk a block in 2 minutes and run a block and 45 seconds how long will it take them to go 18 blocks?

If the class was going to get a class pet and 5 picked fish and 7 pick bird and 8 picked rabbits have many students were in the

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?