You budget $100 each month for parking. Each day you use the downtown parking lot. It costs $5. Write a rule to represent the amount of money left in the monthly budget as a arithmetic sequence. How much money is left in you budget after you have used the downtown parking lot 11 times this month.

To represent the amount of money left in the monthly budget as an arithmetic sequence, we can use a formula that calculates the remaining balance after each use of the downtown parking lot.

Let's break down the given information:
- The initial amount in the monthly budget is $100.
- Each day, you use the downtown parking lot, which costs $5.

We can use the following formula to calculate the amount of money left after n uses of the parking lot:

An = A1 + (n - 1)d

Where:
- An represents the amount of money remaining after n uses of the parking lot.
- A1 represents the initial amount in the monthly budget, which is $100.
- n represents the number of times you use the parking lot.
- d represents the common difference, which is the amount deducted from the budget for each use of the parking lot. In this case, it is $5.

Using this formula, we can find the amount of money left after 11 uses of the downtown parking lot:

A11 = 100 + (11 - 1) * 5
= 100 + 10 * 5
= 100 + 50
= $150

So, after using the downtown parking lot 11 times this month, you will have $150 left in your budget.

M = 100 - 5d

M(11) = 100 - 5(11)