An element with mass 670 grams decays by 27.3% per minute. How much of the element is remaining after 9 minutes, to the nearest 10th of a gram?

There will be 38 grams remaining.

The equation would be of the form

y = a (1+r) ˣ, where a is the initial value, r is the rate as a decimal number, and x is the amount of time. Using our values from the problem, we have:

y = 670 (1-0.273) ^9 = 670 (0.727) ^9 = 38