Answer:
34
Step-by-step explanation:
mid point of 0 and 3 is 1.5, -1 to 0 is 1, so the average value over that is 1.5
then 3 to 1, mid point is 2, with a lenght of 1, so 1.
midpotni of 1 and 5 is 3, over a length of 2, so 6
5 and 8 -> 6.5, length of 2 -> 13
8 and 4 -> 6, length of 1 -> 6
4 and 9 -> 6.5, length of 1 -> 6.5
add em up
1.5+1+6+13+6+6.5 = 34