No.2 beserta caranya thx

2p + 2l = K
2.4x + 2.3x = 84
8x+6x = 84
14x = 84
x = 84 : 14
x = 6

panjang = 4x = 4.6 = 24 cm
lebar = 3x = 3.6 = 18 cm

L = p x l
= 24 x 18
= 432 cm²

maaf klo salah dan semoga membantu