Question

The roots of Billy's plant grew to 3 inches beneath Earth’s surface. Graph all the possible depths the roots can continue to grow?

(which sign)
o--->
<----o
*--->
<----*

Answer 1

just go down negitive -3

Answer 2

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.