How do I rewrite this expression?

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Use this graph to find the cost of 6 show tickets

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.