Asmall tree was planted at a height of 6 feet. the tree has been planted for 16 months, and is now 49.2 feet tall. which equation could be used to find x, the average number of feet the tree grew each month?
a.
6x + 16 = 49.2

b.
49.2x + 6 = 16

c.
16x + 49.2 = 6

d.
16x + 6 = 49.2

Answer would be D.
They already give you the final answer of the height of tree (49.2). They also give you the beginning height (6). The part that is to be figured out is how much did the tree grow in 16 months in order to be added to the initial height in order to equal 49.2 at the end.
16x+6=49.2