Answer:
Explanation:
This is classic right triangle trig. We have the reference angle of 59 degrees, we have the side adjacent to that angle of 4 units, and we are looking for CD which is the hypotenuse of the triangle. That is the cosine ratio:

Filling in:

Doing some algebraic acrobats there to solve for the hypotenuse gives you:

Use your calculator to solve this in degree mode:
hyp = 7.8 units