Atrain travels at an average speed of 67.5 miles per hour at this speed how far can the train go in 3.25 hours?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

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?