Which radioactive element is used to determine the absolute age of late pleistocene animal remains?

Carbon-14 is radioactive element is used to determine the absolute age of late pleistocene animal remains because it is abundant in organic matter. Its decay is first-order and its half-life has been determined to be 5730 years which means that after 5730 years, the amount of carbon−14 will be 1/2 of the initial amount.

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.