A shell casing has been found in the street at the scene of a murder. A signpost and a mailbox are nearby. The distance from the signpost to the front , right leg of the mailbox is 6. The angle from the shell casing to the front, right leg of the mailbox to the signpost is 55. The angle from the shell casing to the sign post to the front, right leg of the mailbox is 30^ . What is the distance from the shell casing to the front, right leg of the mailbox? (b) What is the distance from the shell casing to the signpost?