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(3x+5)+(2x+20)+(5x-17)= 180
10x+8= 180
10x= 172
x= 17,2°
3x+5= 3(17,2)+5= 51,6+5= 56,6°
2x+ 20= 2(17,2)+20= 34,4+20= 54,4°
5x-17= 5(17,2)-17= 86-17= 69°
3.
x=1/3x+13
x-1/3x= 13
2/3x= 13
x= 13/ 2/3= 13.3/2= 39/2= 19,5 tahun
7.
keliling= 2p+2l= 2(28)+2(9x-17)
76= 56+18x-34
-18x=56-34-76
-18x= -54
x= 3cm
nomor 8 ga tau