Which rule represents Ro, 180°?
O (x, y) → (-y, x)
O (x, y) – (-x, -y)
O (x, y) → (y, -x)
O (x, y) → (y, x)

If a sprinkler waters 1 over 12 of a lawn in 1 over 2 hour, how much time will it take to water the entire lawn? (5 points) 10 hours 6 hours 1 over 6 hour 7 over 12 hour