To find the cost of 5 bags using the function $c(x) = 350x$, substitute $x = 5$ into the equation:

$c(5) = 350 \times 5$

$c(5) = 1750$

So, the cost for 5 bags is $1750.

Would you like more details or have any questions?

Here are some related questions you might find interesting:

1. What would be the cost for 10 bags?
2. How would the function change if the cost per bag increased to $400?
3. What is the cost of 3 bags?
4. How many bags can you buy with $2800?
5. If a discount of 10% is applied, what would be the new function?
6. What is the total cost if 8 bags are purchased, but one bag is free?
7. How would the cost function change if there was a fixed fee of $100 in addition to the cost per bag?
8. What is the average cost per bag if 7 bags cost $2450?

Tip: When solving word problems, always identify what each variable in the equation represents and substitute values carefully.