What is the length of a ray whose x-component is - 2 units long and whose y-component is - 4 units long

You can find the length of the ray using Pythagorean's theorem. This theorem relates the three sides of a right triangle. The length of the ray is the hypotenuse, while the other two legs are the x and y components. The solution is as follows:

L = √ (x² + y²)

L = √ ((-2) ² + (-4) ²)

L = 4.47 units