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K(x)= 12x + 4
b)K = 100
12x + 4 =100
x = 8
p = 14,,l = 8 , t = 3
V = plt = 336
=4x+24+4x+4x-20
=12x+4
b) 12x+4=100
12x=96
x=8
ukuran balok→
panjang= 14
lebar=8
tinggi=3
c) volume= plt
=14 x 8 x 3
=336 cm3