apa jawaban nomor 8 ya...

<Q = <S = 5x-4
<P = 7/8<Q

<P + <S = 180°
(7/8 <Q) + (5x-4) = 180°
(7/8.(5x-4)) + (5x-4) = 180°
35/8x - 7/2 + 5x - 4 = 180°
35/8x + 5x - 7/2 - 4 = 180°
35/8x + 40/8x - 7/2 - 8/2 = 180°
75/8x - 15/2 = 180
75/8x = 180 + 15/2
75/8x = 360/2 + 15/2
75/8x = 375/2
x = 375/2 : 75/8
x = 375/2 x 8/75
x = 20 (C)

Semoga terbantu
Maaf jika ada yang salah :)