Answer:
D. (39.6) or 39.0
Explanation:
See the attached worksheet.
Two right triangles are formed in the diagram. Use the pythagorean theorem on both, starting with the lower triangle, since two of the sides are known and the third (d) may be calculated.
1. From the first (bottom) triangle, we find that d is 36.66.
2. Using this value of d in the upper triangle provided a length for x of 39.6, closest to answer option D at 39.0