tolong ya nomer 11, 12, dan 13 pakai cara..

11.
3p² + 7p + 4 = 0
(3p + 4)(p + 1) = 0

12.
K = 2 (p + l)
48 = 2 ( 2x + 3 + x + 6 )
48 = 2 (3x + 9)
24 = 3x + 9
3x = 24 - 9
3x = 15
x = 5
→Lebar = x + 6 = 5 + 6 = 11

13.
4x - 15 > 7x - 3
4x - 7x > 15 - 3
-3x > 12
x > -4
Hp = {-4,-3,-2,-1,0,.. }