The provided diagram of triangle ABC will help you to prove that the base angles of an isosceles triangle are congruent. The fir
st step is to draw auxiliary line AO. What must be true about in order to complete the proof using the ASA (Angle Side Angle) triangle congruency theorem? Classify each statement as needed or not needed to complete the proof. AO bisects BAC
Try this: 8% of 2570 is 2570*0.08=205.6 units and since the number of units were increasing every month you can multiply that by seven giving you 1439.2, then you can subtract that by your final amount of sales giving you the initial amount of 1130.8 units.