Question

An element with mass 290 grams decays by 13.2% per minute. How much of the element is remaining after 14 minutes, to the nearest 10th of a gram?

Answer 1

Remaining = 290*(1 - 0.132)^{14} = 290*(0.868)^{14} ≈ 290*(0.1378085) ≈ 39.9645 g.

To the nearest tenth of a gram: 40.0 g.