Tolong dibantu ya!! Matematika Terima kasih!!!

Yg no 4 a gk bisa
b) 10/15 = x/x+8
15x = 10x+80
15x-10x = 80
5x = 80
x = 80/5
x = 16
5. tv/30 = 10/15
15tv = 30×10
15tv = 300
tv = 300/15
tv = 20

6/6+uw = 10/15
90 = 60+10x
90-60 = 10x
30 = 10x
30/10 = x
3 = x

Luas trapesium = 1/2(jumlah sisi sejajar)t
= 1/2×(20+30)3
= 1/2×50×3
= 75

Maaf kalo salah