An element with mass 510 grams decays by 26.3% per minute. how much of the element is remaining after 7 minutes, to the nearest 10th of a gram?

A decay rate of 26.3% per minute means that for every minute that passes, there remains 73.7% of the amount of the substance available at the end of the previous minute.

If is the starting amount, and is the amount left after minutes, then

and so on, such that

We have grams at the start, so after 7 minutes we're left with