2x=12 what is the answer i’m confused

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices

Me i’m stuck on all these questions besides the two bottom ones