The sequence is given as follow

,

When finding the pattern of a sequence, we can try to work out whether there is a common difference or a common ratio between each term. We try by finding a common ratio



The term to term rule is multiplied by

The

term is given

×

The

term is given by

×
Just minus 5 feet from the new height which is 13ft, and the equation will be 13-5, and therefore the tree grew 8 feet