Step-by-step explanation:
To solve the exercise we must apply the rule of three, or establish a proportion;
We apply the following relationship:
"If in one year the tree grew 7.1 cm, how much would it have grown in 19 years"?
The exercise is as follows:
![\begin{gathered} 1\text{ years}\rightarrow7.1\operatorname{cm} \\ 19\text{ years}\rightarrow x \\ x=(19*7.1)/(1) \\ x=(134.9)/(1) \\ x=134.9\text{ cm} \\ \text{The answer is: }In\text{ 19 years the }tree\text{ grew 134.9 cm} \end{gathered}]()