No 5 aja pls bantu dong pls

keliling persegi
a)
2p + 2l
2(3x-4) 2(x+2)
6x - 8 + 2x + 4
8x - 4

b)
8x - 4 = 60
8x = 64
x = 8

p = 3(8) - 4
= 24 - 4
= 20cm

l = 8 + 2
= 10

semoga membantu