The mean temperature for the first 7 days in January was 3 °C. The temperature on the 8th day was 2 °C.
What is the mean temperature for the first 8 days in January?

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.