1.Suppose p varies inversely as the square root of q. If p=-7 when q=9, what is p if q is 6?

p=_____

2.The stopping distance d of an automobile is directly proportional to the square of its speed v. A car required 50 feet to stop when its speed was 80 miles per hour. Find a mathematical model that gives the stopping distance d in terms of its speed v.

Your answer is d=_____

Estimate the stopping distance if the brakes are applied when the car is traveling at 62 miles per hour.

Your answer is_____.

3.If the point is on the unit circle in quadrant IV, then y=___.