Use a variation model to solve for the unknown value. Use k as the constant of variation. The stopping distance of a car is directly proportional to the square of the speed of the car. (a) If a car travelling 45 mph has a stopping distance of 141.75 ft, find the stopping distance of a car that is travelling 85 mph. (b) If it takes 28 ft for a car to stop, how fast was it travelling before the brakes were applied? Part: 0 / 6 Part 1 of 6 Label the variables. Let d represent the stopping distance of a can Let s represent the speed of the car.

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A: Solution: The objective is to find the value of x