Pls Help

A bomb goes off next to the wall of a church. Fortunately, no one is hurt. The wall runs East to West and the bomb was just South of it. A forensics expert finds two fragments in the wall. From their penetration, she estimates they were both moving at 100 m/s. The first hit 34o West of North and had a mass of 3.1 kg. The second hit 41o East of North and had a mass of 4.6 kg. The expert suspects that there was an additional large fragment she needs to recover. Unfortunately, the wall faces a large field and searching the whole field will take time. The sooner she recovers the bomb parts, the better for the investigation.

a) [45 points] In what direction should the forensics expert order a search? Express your direction as a compass angle in degrees clockwise from North for the officers with metal detectors. Define you axes.

b) [15 points] Assuming the missing fragment had the same speed as the recovered fragments, what is its mass?

It's on chegg if anyone pays for that :(