Answer:
This sentence is true.
Step-by-step explanation:
Answer:
sorry I don't know just ask to any one
Answer:
(1, 2), (2, -3), (3, 4), (4, -5)
Step-by-step explanation:

all you have to do next is add all of them in one equation and equate them to 18
when you find x, replace in each expression to get your answers