Answer:
y = 2.7x
Explanation:
The thing in the chart is a function.
If you look at the y values, there is actually a pattern.
This pattern is that every 5 years, the tree grows exactly 13.5 cm.
This is constant throughout the entire chart.
This means that the function is linear because there is constant addition.
a and d are both exponential so they would not be the answer.
The answer is b because 13.5 is the growth every 5 years.
Divide 13.5 by 5, and you will get 2.7, the constant growth over 1 year.