Respuesta :

The tree might be 13ft tall because what I did was that I subtracted 15 from 22 and then got 7. Adding this 7 to the 6 to get 13ft.

Hope this helps. Sorry if wrong.
Hello There

Answer: 13

Here are the steps:
First we  subtract 15 from 22 and then got 7

15 - 22 = 7

Finally we Add 7 + 6 = 13 

Which is our final answer

I hope I helped
-Chris.