**1. Can the numbers in an arithmetic sequence go down?**

Yes, if the common difference is negative the terms

willdecrease.

**2. Do you HAVE to take the first term away from the second term to find the common difference?**

No, this will work, but you can subtract

ANYterm from the one after it to find the common difference.

**3. Does the common difference have to be the same between every pair of terms for a sequence to be an arithmetic sequence?**

Yes.

**4. How are arithmetic sequences used in real life?**

Anywhere there is a

patternthere is probably a sequence of some sort.e.g. Laying tiles or paving stones or depositing a fixed amount of money each week into a bank account could form arithmetic sequences.