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Your house is 2 miles away from the pool.
To calculate the distance between two points on a coordinate plane, you can use the distance formula:
d = sqrt((x2 - x1)^2 + (y2 - y1)^2)
In this case:
x1 = 2, y1 = 18
x2 = 2, y2 = 20
d = sqrt((2 - 2)^2 + (20 - 18)^2)
d = sqrt(0 + 4)
d = sqrt(4)
d = 2
So your house is 2 miles away from the pool.