The Society for the Advancement of Skim Milk has 4 members. They decide
to select a president and a vice president. How many different "president/vice
president" combinations are possible? (Do not include units in your answer.)

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.