### Home > CCAA > Chapter 2 Unit 4 > Lesson CC3: 2.1.3 > Problem 2-30

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

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

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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?

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