How do i do interpret constant of proportionality in graphs

Afurniture store has 1,500 chairs in storage. a manager uses three delivery receipts to simulate samples to check 100 chairs and note the number of brown chairs. suppose the actual number of brown chairs is 1,080. about how many brown chairs are

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale