Charlie rented a truck for one day. There was a base fee of $17.99, and there was an additional charge of 81 cents for each mile driven. Charlie had to pay $213.20 when he returned the truck. For how many miles did he drive the truck?

To solve this, you need to start by writing out an equation. Since there was a base fee of 17.99, and. 81 cents for each mile driven, you'll have 17.99 +.81x, where x represents how many miles driven. If he paid 213.20 at the end, you know that's what 17.99 +.81x will have to equal.

So you have:

17.99 +.81x = 213.20

Now you need to solve for x. Do you know how to solve for x here?