Under certain conditions, the average cost of a medium sedan in 2012 was $0.66 per mile. how much would it have cost to drive such a car 15,000 miles in 2012

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Tom drove 206 miles in 3.9 hours. estimate his average speed.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?