Sequence of figures showing increasing block patterns.

Let's analyze the pattern in the figures step by step.

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Step 1: Observe the Figures

We are given three figures made of orange squares. Each figure has:
- A horizontal base (bottom row)
- A vertical stack (top part) centered on the base

Let’s count the number of squares in each:

#### Figure 1
- Base: 3 squares
- Vertical stack: 2 squares
- Total: 5 squares

#### Figure 2
- Base: 5 squares
- Vertical stack: 3 squares
- Total: 8 squares

#### Figure 3
- Base: 7 squares
- Vertical stack: 4 squares
- Total: 11 squares

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Step 2: Identify the Pattern

Let’s look at how the base and stack change with the figure number:

| Figure Number | Base Length | Stack Height |
|---------------|-------------|--------------|
| 1 | 3 | 2 |
| 2 | 5 | 3 |
| 3 | 7 | 4 |

We can see:
- Base length increases by 2 each time: 3 → 5 → 7 → ...
- Stack height increases by 1 each time: 2 → 3 → 4 → ...

So:
- Base = 2 × (figure number) + 1
- For Figure 1: 2×1 + 1 = 3 ✔
- For Figure 2: 2×2 + 1 = 5 ✔
- For Figure 3: 2×3 + 1 = 7 ✔
- Stack height = figure number + 1
- Figure 1: 1 + 1 = 2 ✔
- Figure 2: 2 + 1 = 3 ✔
- Figure 3: 3 + 1 = 4 ✔

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Answer to Question 1:

> As the figure number changes, the number of squares in the base and the height of the vertical stack also changes.

Alternatively, more precisely:
> As the figure number changes, the size of the base and the height of the tower also changes.

Or even better:
> As the figure number changes, the number of squares in the figure also changes.

But since the question asks what *also* changes, and we're observing both base and stack changing, a good answer is:

✔ As the figure number changes, the number of squares in the base and the height of the vertical stack also changes.

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Answer to Question 2: Draw Figure 4 and Figure 5

#### Figure 4:
- Figure number = 4
- Base = 2×4 + 1 = 9 squares
- Stack = 4 + 1 = 5 squares
- So: a horizontal base of 9 squares, with a vertical stack of 5 squares centered on it.

#### Figure 5:
- Figure number = 5
- Base = 2×5 + 1 = 11 squares
- Stack = 5 + 1 = 6 squares
- So: base of 11 squares, stack of 6 squares centered.

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Drawing Instructions (Text Representation)

Since I can't draw images here, I'll represent them using text.

#### Figure 4:
```
□
□
□
□
□
□ □ □ □ □ □ □ □ □
```

(Vertical stack of 5 squares, centered on a base of 9 squares)

#### Figure 5:
```
□
□
□
□
□
□
□ □ □ □ □ □ □ □ □ □ □
```

(Vertical stack of 6 squares, centered on a base of 11 squares)

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✔ Final Answers:

1. As the figure number changes, the number of squares in the base and the height of the vertical stack also changes.

2.
Figure 4:
- Base: 9 squares
- Stack: 5 squares (centered)

Figure 5:
- Base: 11 squares
- Stack: 6 squares (centered)

You can now draw these accordingly — just make sure the vertical stack is centered on the base.