PLEASE HELP! What is the standard deviation of the data represented by this normal distribution?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?

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.