To create an equation that represents the total number of miles Mr. Arnold drives to work in a week, we can start with the information provided:
- Mr. Arnold drives 130 miles for a round trip each day.
- He works five days a week.
Let \( m \) represent the total miles Mr. Arnold drives in a week. The equation to calculate this would be:
\[ m = \text{(miles per day)} \times \text{(number of days)} \]
Substituting in the known values:
\[ m = 130 \text{ miles/day} \times 5 \text{ days} \]
This simplifies to:
\[ m = 650 \text{ miles} \]
So, the total distance Mr. Arnold drives in a week is 650 miles.