Answer :

Sure! Let's solve this question step by step.

We are given:
- The key is [tex]\(13 \mid 7 = 137\)[/tex].

From this key, we understand the format:
- "13" is the stem.
- "7" is the leaf.
- When combined, they form the number 137.

Next, we need to identify the leaf in the expression [tex]\(40 \mid 9\)[/tex].

To apply the same format:
- The stem in our case is "40".
- The leaf is the number after the [tex]\('\mid'\)[/tex], which is "9".

Therefore, the leaf of [tex]\(40 \mid 9\)[/tex] is:

9

So, the answer to the question is:
9

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Rewritten by : Barada