Rachel decided to have bouncy balls as a party favor. she determines that her ratio of bouncy balls to guests is 9: 3. explain how to find the number of balls needed for 30 guests.

Write a corresponding real world problem to represent 2x - 125=400

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?

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *