Please help me with this question and show work please Garcia’s

Choice B

n-4 = 32

Explanation:

We start with n students. The n is a placeholder for any positive whole number. After 4 of them drop the class, we're left with n-4 students.

Then we set that equal to 32, since that's the number of students left over.

This leads to the answer of n-4 = 32

Solving this equation gets us n = 36. We add 4 to both sides.

it would open into a square depending on the type of envelope i’m not sure about the second part