7. The more aerodynamic a vehicle is, the less fuel the vehicle's engine must use to overcome air resistance. To design vehicles that are as fuel efficient as possible, automotive engineers use the formula R = 0.00256 x Dc x FA X 52 where R is the air resistance (in pounds), De is the drag coefficient, FA is the frontal area of the vehicle (in square feet), and s is the speed of the vehicle (in miles per hour). The formula assumes that there is no wind. (a) Rewrite the formula to find the drag coefficient in terms of the other variables. (b) Find the value of the drag coefficient of a car when the air resistance is 50 pounds, the frontal area is 25 square feet, and the speed of the car is 45 miles per hour