Hi really need help and the answer is not 10.5

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

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

2.5 milligrams is equivalent to how many grams