Hint:

If the plants are starting at -3, I would say that the plants can grow further down past negative three. I would draw an open circle at -3, then have the arrow pointing to the left. This shows that the roots can grow lower than -3.

f(1) = 5

f(2) = 3

f(3) = 1

Let y = f(f(x))

When x = 2, y = f(f(2)) = f(3) = 1

When x = 3, y = f(f(3)) = f(1) = 5

So the points (2, 1) and (3, 5) must be on the graph of y = f(f(x))

ab + cd = 2 * 1 + 3 * 5 = 2 + 15 = 17

help

it wrong :(