The waitress gets 45/75 = 3/5 of the tips
so waitress gets 3/5 * 350 = $210
7X-4=6X-4-X
7X-6X+X=0
2X=0
X=0
9(3b-2) Iv factorised it but I dont know the rest sorry
Answer: A probability of 1 means the event is certain to happen. A probably of zero means the event is certain not to happen.