What is the inverse of the function f(x)=19/x3

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.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers