bantuin kaka :d yahhh

1. C

7.
3 (x + 2) + 5 = 2 (x + 15)
3x +6 +5 = 2x + 30
x = 24 -5
x = 19

x + 2 = 19 + 3 = 21 (C)

10.
2 (2 + x + x) = 32
4 + 2x + 2× =32
4× = 28
×=7

p= 2 + × = 2+7 =9
l = × = 7

luas = p × l = 9 × 7 = 63


11.
(3x -3)(× +1)=72
3x^2 + 3× - 3x = 72
3x^2 = 75
×= 25

3× -3 = 3 (5) -3
=15- 3
=12

aku bantuin no. 1 - 10 aja ya....