Answer:
18.136 units of distance
Explanation:
d = sqrt((x2 - x1)^2 + (y2 - y1)^2)
where (x1, y1) = (2, 1) and (x2, y2) = (12, 18)
d = sqrt((12 - 2)^2 + (18 - 1)^2)
= sqrt(10^2 + 17^2)
= sqrt(329)
≈ 18.136
Therefore, the rock traveled approximately 18.136 units of distance.