The nine Ring Wraiths want to fly from Barad-Dur to Rivendell. Rivendell is directly north of Barad-Dur. The Dark Tower reports that the wind is coming from the west at 54 miles per hour. In order to travel in a straight line, the Ring Wraiths decide to head northwest. At what speed should they fly (omit units)

76.37 mph

Explanation:

The speed of wind is 54 miles per hour.

-Northwest direction forms a 45°. The west constituent needs to cancel out the 54mph.

-From this we notice that the west and northwest are the isosceles sides of a right triangle, we therefore use the Pythagorean Theorem to find the speed of the 3rd constituent(Hypotenuse):

Hence, they have to fly at 76.37 mph

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.