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Verified answer
Turunanlaju pertambahan rusuk 7 cm/.menit
ds/dt = 7
V = 64
s³ = 64
s = 4
Luas = 6 s²
dl/ds = 12s
dl/dt = 12 (4)= 48
laju pertambahan luas = dl/dt
dl/dt = dl/ds . ds/dt
dl/dt = 48 (7)
dl/dt = 336 cm²/menit