The diameter of a regulatiom soccer ball is about 8 3/5 inches

What is always true about a positive integer raised to a negative odd power?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Aye asap pls ! markin da brainiest too ! btw da step choices are all add, distribute, divide, n subtract