Joan babysits for 6 dollars per hour.

To determine how much money Joan earns for babysitting, we need to know the number of hours she babysits for. Let's say Joan babysits for x hours.

To calculate the amount of money Joan earns, we multiply the number of hours (x) by the rate per hour. The rate is given as $6 per hour.

Therefore, the formula to calculate the amount of money Joan earns is:
Money earned = Rate per hour * Number of hours

In this case, the formula becomes:
Money earned = 6 dollars/hour * x hours

Now, if you provide the specific number of hours Joan babysits, we can use this formula to find the amount of money she earns.