1. **State the problem:** We need to find an expression that represents the total cost to join an online learning community, which has a $20 startup fee and a $5 monthly fee. 2. **Identify the variables and constants:** Let $m$ represent the number of months. 3. **Write the formula:** Total cost = startup fee + (monthly fee \times number of months) 4. **Substitute the values:** Total cost = $20 + 5m$ 5. **Interpret the options:** - $5m$ represents only the monthly fees without the startup fee. - $5m + 20$ correctly represents the monthly fees plus the startup fee. - $20m + 5$ incorrectly multiplies the startup fee by months and adds 5. - $25m$ incorrectly sums fees per month without separating startup fee. 6. **Conclusion:** The expression that best represents the total cost is **$5m + 20$**.