I can see that the image contains exercises related to recognizing and simplifying like terms.

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Task: Recognize like terms

1. The exercise asks to tick pairs of like terms.

   • Like terms are those that have the same variables raised to the same power, even if their coefficients are different.

   The circled pairs are:

   • $5x$ and $-3x$: These are like terms because both involve $x$.
   • $2a$ and $a$: These are like terms because both involve $a$ (note: $a$ is equivalent to $1a$).
   • $4ab$ and $3ba$: These are like terms because $ab = ba$ (commutative property).

The uncircled pairs are not like terms because either their variables are different or their exponents do not match.

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Task: Simplify expressions using like terms

1. Simplifying involves combining the like terms.

   The given answers are:

   • $4c - 2d - 5c + 6d = 9c - 8d$: This correctly combines like terms for $c$ and $d$.
   • $2x^2 - 4x + 3 - 5x^2 + 4x - 2 = 7x^2 + 8x - 1$: This correctly combines like terms for $x^2$, $x$, and the constant terms.

Would you like further details or explanations on any part of this solution? Here are 5 related questions to think about:

1. How do we define like terms more formally?
2. Why are $ab$ and $ba$ considered like terms even though their order differs?
3. What happens if we try to combine terms that aren't like terms?
4. Can two constants (like $5$ and $7$) be considered like terms?
5. How can we apply this process to equations instead of expressions?

Tip: Always focus on the variables and their exponents to identify like terms, as coefficients can vary.