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Let's break down and solve the problem step by step.

### Part (a):
Zak has 11 shirts and 8 ties in his wardrobe. On Thursday morning, he picks one shirt and one tie at random.

To determine how many possible combinations of shirts and ties Zak can choose:

- Number of shirts: 11
- Number of ties: 8

The number of combinations is simply the product of the number of choices for shirts and ties:
\[
\text{Combinations} = 11 \times 8 = 88
\]
So, there are **88 possible combinations** Zak can choose from on Thursday morning.

### Part (b):
On Thursday evening, Zak puts the tie back in the wardrobe, but **not** the shirt. On Friday morning, he picks a shirt and a tie again at random from what's left.

- On Friday morning, Zak has 10 shirts (since he didn't return the shirt from Thursday) and 8 ties (because he put the tie back).
  
The number of combinations on Friday morning would be:
\[
\text{Combinations} = 10 \times 8 = 80
\]
So, Zak has **80 possible combinations** on Friday morning.

### Summary of answers:
- **(a)** 88 combinations on Thursday morning.
- **(b)** 80 combinations on Friday morning.

Would you like more details on any part of the solution or further explanations? 

Here are 5 related questions:
1. What if Zak had 15 shirts and 10 ties? How many combinations would there be?
2. What if Zak did not return either the shirt or the tie for the second day?
3. How would the answer change if Zak had to pick a specific tie color each day?
4. What if Zak could only wear certain shirts with specific ties? How would you calculate the combinations then?
5. How many combinations would there be if Zak chose 2 ties instead of 1?

**Tip:** In combination problems, always remember to multiply the number of independent choices available at each stage to get the total number of possibilities.

Zak has 11 shirts and 8 ties in his wardrobe. On Thursday morning, he picks a shirt and a tie at random from the wardrobe. How many possible combinations are there? On Thursday evening, he puts the tie back in the wardrobe but not the shirt. On Friday morning, he picks a shirt and a tie at random from the wardrobe again.

Solve a combinatorics problem where Zak has 11 shirts and 8 ties. Learn how to calculate the number of possible combinations on Thursday morning (88) and on Friday morning (80) when Zak returns the tie but not the shirt. Suitable for Grades 6-8.

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