A person walked 3 miles at 30 degrees to the horizontal, 2 miles at 100 degrees to the horizontal, 5 miles at 240 degrees and 1 mile at 325 degrees. What is the person's total displacement

Do you mean Clockwise from the north (which is called bearing) instead to the horizontal?

Displacement is final position - original position. It has magnitude and direction.

You will need to resolve each component displacement into two orthogonal (or perpendicular) components such as x and y.
Sum algebraically each component and the total will be the components of the displacement. Combine the two components (√(x²+y²)) and determine the direction (arctan(y/x)).
Give it a try and post your results for checking if you wish.