​ The height of a tree in feet over x years is modeled by the function f(x).

Look at the graph here :

https://www.desmos.com/calculator/jj4kxyynwi

The first statement is true

The second is true, as well  ⇒ year 5   = 8.8 ft   ,  year 7 = 15.9 ft

The third statement is false.....the initial  height is 1 ft

The fourth statement is also true.....when x  = 15, the tree has almost reached its max height  of about 30 ft