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The problem describes a diver's ascent with the following depths at consecutive minutes:

- 1st minute: -53 feet
- 2nd minute: -52 feet
- 3rd minute: -51 feet
- 4th minute: -50 feet
- 5th minute: -49 feet

The sequence of depths is \(-53, -52, -51, -50, -49\). 

### Part A: Common Difference
The difference between consecutive terms is constant:
\[
-52 - (-53) = 1, \quad -51 - (-52) = 1, \quad -50 - (-51) = 1, \quad -49 - (-50) = 1
\]
Since the difference is the same for each pair of consecutive terms, the sequence has a common difference. This makes it an **arithmetic sequence**.

### Correct Answer:
- (A) The sequence **has a common difference**.
- (B) The sequence is **arithmetic**.

Would you like further details or clarification?

Here are 5 related questions:
1. What is a common difference in arithmetic sequences?
2. How do you find the next term in an arithmetic sequence?
3. How do geometric sequences differ from arithmetic sequences?
4. How can we find the sum of an arithmetic sequence?
5. Can a sequence have both a common difference and a common ratio?

**Tip:** When identifying a sequence type, always check for consistent differences (arithmetic) or ratios (geometric).

Hunter, a recreational SCUBA diver, begins his ascent to the surface at a constant rate. After 1 minute, he is at a depth of -53 feet. After the 2nd minute, his depth is -52 feet, and a minute later his depth is -51 feet. After the 4th minute, he is at -50 feet, and one minute after that his depth is -49 feet. Classify the sequence by completing the sentence.

Learn how to classify a sequence of diver's depths using the concept of arithmetic sequences. The problem focuses on identifying the common difference between consecutive terms, making it a fundamental arithmetic sequence. Suitable for students in Grades 6-8.

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