She gave him 28 seashells
Divide any term by the term before it, and you'll get the common ratio of the geometric series.
-81/-27=3
The common ratio is 3.
Hi I'm new to this website so I wanted to comment that I'm having the same complication with that exact same problem
CMR for the first and MRC for the second
JUST TRUST YOU DON'T HAVE TIME
