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The image you uploaded shows a table with altitudes and a couple of questions. Let's work through the problems step by step.

### (a) How much lower is Checkpoint 1 than Checkpoint 2?
The altitude at Checkpoint 1 is -193 feet, and at Checkpoint 2, it's 3,312 feet. The difference can be found by subtracting the altitude of Checkpoint 1 from that of Checkpoint 2:

\[
\text{Difference} = 3,312 - (-193) = 3,312 + 193 = 3,505 \text{ feet}
\]

So, Checkpoint 1 is 3,505 feet lower than Checkpoint 2.

### (b) The top of a hill rises 139 feet above Checkpoint 1. What is the altitude of the top of the hill?
The altitude at Checkpoint 1 is -193 feet, and the hill rises 139 feet above that:

\[
\text{Hill altitude} = -193 + 139 = -54 \text{ feet}
\]

So, the altitude of the top of the hill is -54 feet.

Let me know if you would like further details or clarifications.

### Related Questions:
1. What is the difference in altitude between Checkpoint 3 and Checkpoint 4?
2. What is the difference in altitude between the highest and lowest checkpoints?
3. How would you calculate the average altitude across all checkpoints?
4. What is the total change in altitude from Checkpoint 1 to Checkpoint 5?
5. How much does Checkpoint 2 rise above Checkpoint 5?

### Tip:
When working with altitudes, always be careful with signs (positive and negative) to ensure you calculate differences correctly!

How much lower is Checkpoint 1 than Checkpoint 2? The top of a hill rises 139 feet above Checkpoint 1. What is the altitude of the top of the hill?

Learn how to calculate the altitude difference between checkpoints and find the altitude of a hill rising above Checkpoint 1. This problem involves subtracting altitudes and adding elevation changes. Suitable for students in Grade 6-7.

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