jawab dong no.2,4,5,7,10,11 tolong pake cara ya pliss..

2. 2x + 3x + 4x = 180
9x = 180
X= 20
2x = 2x20 =40
3x= 3x20 = 60
4x = 4x20=80
4. Tumpul
5. 4x+6x+80=180
10x+80=180
10x =180-80
10x=100
X=10
7. L= 1/2 at
= 1/2 24x10
=120
11. 2x+3x=120
5x=120
X=24
Maaf ya kalo salah :))