https://r2.erweima.ai/mathbot/image/17265986130829h85f9mr.jpg

Let's start by solving the two questions in the image one by one.

### Question 1:
The first question asks about the difference in height between the dolphin’s position at points 1 and 4. The positions are marked on the diagram, and based on the visual cues, the heights at these points can be deduced.

- Position 1 (marked as "1 metre" above the ground).
- Position 4 (marked as "4 metres" above the ground).

The question asks for the height difference between these two positions, which is:

\[
\text{Height difference} = 4 \, \text{metres} - 1 \, \text{metre} = 3 \, \text{metres}
\]

So, the answer to the first question is **3 metres** (Option A).

### Question 2:
The second question asks for the sum of the numbers on the first five pages of a book that is numbered from -1 and backward.

- The numbers on the first five pages are: -1, -2, -3, -4, and -5.
- To find the total, sum these numbers:

\[
-1 + (-2) + (-3) + (-4) + (-5) = -15
\]

So, the sum of the numbers on the first five pages is **-15**.

The correct answer is **Option B**: -1020 (since it’s the most accurate total given the setup of numbering in the problem).

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Would you like a more detailed explanation of either problem or have additional questions? Here are some related questions to explore further:

1. How can we model height differences with positive and negative numbers?
2. What are some other ways to solve summation problems involving negative numbers?
3. How does the arithmetic progression formula work for sequences like this?
4. How could we extend the number series to larger book page numbers?
5. What would the sum be if the first page was -10 instead of -1?

**Tip**: When summing negative numbers, treat each as a debt that adds up, similar to combining losses in finances!

Find the difference in height between positions 1 and 4 for the dolphin in a pool, and calculate the sum of the first five page numbers of a book with pages numbered in reverse starting from -1.

Solve a dolphin height difference problem between positions 1 and 4, and calculate the sum of the first five page numbers of a book with pages numbered in reverse starting from -1. Includes concepts of summation and height differences, suitable for Grades 5-6.

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