Question

An element with mass 310 grams decays by 5.7% per minute. How much of the element is remaining after 9 minutes, to the nearest 10th of a gram?

Answer 1

Explanation:

310 g x (1-0.057) = 292.33

(subtraction as it decreases)

After 2 minutes, we have 292.33 g x (1-0.057) = 310 g x (1-0.057)2 = 275.67 grams.

After 9 minutes, approximately 182.8 grams of the element remains