tolong mbak maz jwb ya (tolong banget)

10. A
7xy - 4xz + 6yz - 10xy - xz - 5yz
= -3xy - 5xz + yz

11. B
7 - 2x < 4x - 5
= 7+5<4x + 2x
= 12 < 6x
= x > 2

12. B
2(p + l) = 60
2(5x-2+x+8) = 60
10x - 4 + 2x + 16 = 60
10x + 2x = 60-16+4
12x = 48
x = 4

p = 5x - 2
= 5(4) - 2
= 18
l = x + 8
= 4 + 8
= 12

L = p x l
= 18 x 12
= 216
semoga membantu