Question

use counters to subtract - 3 - - 1. you start with: you subtract: which picture shows the difference?

Explanation:

Step1: Simplify the subtraction expression

We know that $-3-(- 1)=-3 + 1$.

Step2: Calculate the result

$-3 + 1=-2$.
We start with 3 negative - counters (red circles with a line) and we are subtracting 1 negative - counter. So we should end up with 2 negative - counters.

Answer:

The picture with 2 red circles with a line shows the difference.