Please help me as soon as possible; your help is highly appreciated .The topic is Probability. I will give 5 stars rating to whoever helps me first ,and correctly does so.

What’s the numerical coefficient of 6xy

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?