Answer: I’m so sorry if this is wrong
But Point A is 0m so if you add on the 15.0m it takes to get from A to B and then it C if you add them together it -15 as 15 + -30 is -15 then to get to C to D is -30 + -20 which is -50 so add that to -15 it’s -65 then add -20 , 10 and 5 together which is -5 so -65 + -5 is -70 but if it’s not that try -25
Hope that was some help!