HELP PLEASE!! The angle of depression from a plane to the
airport is 45°. The pilot reports that the altitude of
the plane is 3,000 ft. What is the horizontal
distance between the plane and the airport?

Step-by-step explanation:

The area of a rectangle is A = lw.  If the area is 64, we sub it in to get 64 = lw.

If we want to express the perimeter in terms of w using that area expression, we solve the area for l:

The formula for the perimeter of a rectangle is

P = 2l + 2w

If we are to express it in terms of w, sub in the l value from the area:

which simplifies to

Because this is width and width is a distance measure, it can't ever be negative or 0, so the domain for w is w > 0.