#1: A) you need to know where a vertex goes on a isosceles triangle... I attached a picture that explains it..... you also want to label triangle.... XYZI put a picture on of how you should of labeled the triangle... B)so we need to find Measure for each angle.... REMEMBER: A triangle angles needs to = 180.so your equations will need to be equal to 180. 4x+4+2x+2+7x-8=180so we combine liked terms4x+2x+7x=13x4+2-8=-213x-2=180+2 +213x=182/13 /13x=14now you plug in X4(14)+4= 60 2(14)+2= 30 7(14)-8= 90now you want to check you answers so add them up to see if your answers equal 180...60+30+90=180to be continued.... i do second question on a second answer since i dont want pictures to get mixed up