Please help with this math problem!

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.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

To determine the number of deer in a forest a forest ranger tags 280 and releases them back