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3-86.

Refer to the diagram at right to answer the questions below.

$\array{++++\\ \qquad------}$

1. Copy the diagram and add two pieces so that the result is a value of $-2$. You can add positive and/or negative pieces. Show the pieces you added to get this answer

This problem is very similar to problem 3-34. Last time, you were told how many pieces to add or subtract. This time, you will need to use your own understanding to determine how best to reach $-2$ by adding two pieces.

Since the current value of this diagram is $-2$, you will need to add one negative piece
and one positive piece to keep the value of $-2$.

2. Copy the diagram again, but this time remove four pieces (again positives and/or negatives) so that the result is a value of $2$. Show the pieces you removed to get this answer.

You already know the current value is $-2$. By only removing pieces from the picture,
how does $-2$ become $2$? Think about this question, then proceed with the problem.

Use the following eTool to answer the questions.
Click the link at right for the full version of the eTool:
3-86 HW eTool