What is 4(-7). this is my first day here

Which expression is equivalent to 2x^2+7x+4?

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.

Simplify the expression 10/11(22z) + (a+5) -1