### Home > CC3 > Chapter 2 > Lesson 2.1.3 > Problem 2-30

Determine the zero pairs and remove them. What is an expression for the remaining tiles?

Use the eTool below to find the simplified algebraic expression.

Click the link at right for the full version of the eTool: *2-30a HW eTool*

On this mat, both -tiles in the (+) region can be removed, since they make a zero pair. Next, flip the

Use the eTool below to find the simplified algebraic expression.

Click the link at right for the full version of the eTool: *2-30b HW eTool*

Unlike in parts (a) and (b), this problem has no zero pairs.

However, here is an un-simplified expression to get you started.

Can you simplify that expression?

Use the eTool below to find the simplified algebraic expression.

Click the link at right for the full version of the eTool: *2-30c HW eTool*