a collector found a bone near former mayan territory. after careful research it has been determined that the bone lost about 15% of its carbon-14. How old is the bone?

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.