Need answer fast

one year after a tree is planted, the tree is 3.5 ft tall. each year, the tree grows 1.5 ft. what function, written in sequence notation, models the height of the tree n years after it is planted?

a. an=3.5n+1.5

b an=1.5n+3.5

c. an=1.5n+2

d. an=5n+1.5

Question 2 (essay worth 10 points) (03.02 mc) in δabc shown below, point a is at (0, 0), point b is at (x2, 0), point c is at (x1, y1), point d is at x sub 1 over 2, y sub 1 over 2, and point e is at the quantity of x sub 1 plus x sub 2 over 2, y sub 1 over 2: triangle abc is shown. point d lies on segment ac and point e lies on segment bc. a segment is drawn between points d and e. point a is at the origin. prove that segment de is parallel to segment ab.