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Hi I am trying to do question 8 RAB Consulting in the BPP study text on pg 408. I am having problems with step 6 find the coordinates of A (answer pg 435) Can someone explain why we have to multiply workings 2 with 2.5. Also how did they get to 20a + 685.02 and a = 32.94. Other than that I have the correct answers but I can’t move forward until I understand these numbers.
Many Thanks
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