1. Does that vending machine also sell snacks?
2. I want it, but it is out of my budget.
3. He excels in science, but struggles in Literature.
4. It tastes bad indeed, but it is very nutritious!
5. That child has to be under adult supervision here.

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1.
Rachel: Does that vending machine also sell snacks?
Correct: Does that vending machine sell snacks?
Explanation:
*You write also too add details. In your example, you don't need to use also.

2.
Rachel:  I want it, but it is out of my budget.
Correct: No correction

3.
Rachel: He excels in science, but struggles in Literature.
Correct: He excels in science, but struggles in Literature.
Explanation:
*Science is a subject. The word is considered as a proper noun, so it must be capitalized.

4.
Rachel: It tastes bad indeed, but it is very nutritious!
Correct: No correction


5.
Rachel: That child has to be under adult supervision here.
Correct: No correction

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Hello, Rachel! Thank you for submitting your homework. Please read the following corrections and explanations carefully. If you have questions and clarifications, you can ask me in our class. Thank you!