A particle moves along the x-axis so that its position at time 0 _ t

A particle moves along the x-axis so that its position at time O < t < 18 is given by (t), whose graph is shown in the figure below. Find the total distance traveled by the particle on the interval 0 < t < 18. y 8 6 6 8 9 1 11 12 13 14 15 16 17 18 19 -6 -8