Adults and children can sign up for a virtual fun run race. It costs $30 per adult and $20 per child for the fun run race. The expression 30a + 20c can be used to calculate the cost (in dollars) for adults and c children to participate in the virtual fun run. Use the expression to determine the total cost (in dollars) for 2 adults and 4 children to participate in the fun run.

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

Which of the following represents a function? 50 !

Ineed the solution to this problem and the steps.