To find the total dollar amount Leila earned this month, let's break down her earnings from each job:

• Let $t$ represent the number of hours Leila worked as a tutor.
• Therefore, the number of hours she worked as a waitress will be $86 - t$, since she worked a total of 86 hours combined at both jobs.

Tutor Earnings:

She earns $9 per hour as a tutor, so her earnings from tutoring are: $9t$

Waitress Earnings:

She earns $10 per hour as a waitress, and she worked $86 - t$ hours as a waitress. So, her earnings from waitressing are: $10(86 - t)$

Combined Total Earnings:

The total amount Leila earned this month is the sum of her earnings from both jobs: $\text{Total Earnings} = 9t + 10(86 - t)$

This expression represents the combined total dollar amount Leila earned this month.

Would you like a step-by-step simplification of this expression or further details on its components?

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Here are some related questions:

1. What is Leila's total earnings if she worked 40 hours as a tutor?
2. How many hours must Leila work as a tutor to earn at least $500 from that job alone?
3. If Leila worked 50 hours as a waitress, how much did she earn this month in total?
4. How much will Leila earn if she only works as a tutor for all 86 hours?
5. What is the maximum possible amount Leila could earn this month by working more hours as a waitress?

Tip: When solving word problems, clearly define variables and write out expressions step by step to avoid confusion.