CPM Homework Help : MC1 Problem 3-86

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

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

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
Hint (a):
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.
Answer (a):
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 $-2$ .
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.
Hint (b):
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