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?

Every 1 minute, you multiply the mass by 27.7% or 0.277

after 1 minute, you multiply once

after 2 minutes, you multiply twice

3, thrice

etc

so after 13 minutes, you multiply 13 times or 0.277^13

so what is 970g * 0.277^13 = ?

970 * (1-0.277) ^ (13)

=14.3