### Home > CCA > Chapter A > Lesson A.1.6 > Problem A-61

The circled tiles can be removed, since they make zero pairs. What is an expression for the remaining tiles?

Use the eTool below to find the simplified algebraic expression.

Click on the link at right for the full eTool version: *CCA A-61a HW eTool*

On this mat, both -tiles in the (

Use the eTool below to find the simplified algebraic expression.

Click on the link at right for the full eTool version: *CCA A-61b 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 on the link at right for the full eTool version: *CCA A-61c HW eTool*