Which one of the four diagrams represents X’?

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?

52 cm radius = diameter = area = circumference = circumfer

The product of 3 and a number increased by 8 is 31