Please help me I’m terrible with things like this!!!

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

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?

Use the distance formula to find the distance between (-3,5) and (3,1)