An archeologist runs a carbon dating test on bones found in Olduvai Gorge in Tanzania. She discovers that the carbon-14 isotopes in the bones have undergone three half-lives. Carbon-14 has a half-life of 5,730 years. Approximately how old are the bones? 1,910 years old

3,000 years old

5,730 years old

17,190 years old

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt