An element with mass 970 grams decays by 27.7% per minute. how much of the
element is remaining after 13 minutes, to the nearest 10th of a gram?

14.35 grams

Step-by-step explanation:

Amount left, in grams = (970 grams)(1.000 - 0.277)^m, where m is the number of minutes.  This is exponential decay.

Amout left = (970 grams)(0.723)^13 = (970 grams)(0.01475), or 14.35 grams

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value