Find the sum of 8x + 4y and -2x - 3y

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

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 the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).