Guys I need help, what is 1+1 (first answer gets brainleist and 100 points)

Which expression gives you the distance between the points (5,1)and(9,-6)

This is about circle theorems. someone asap : (

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.