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Verified answer
Jawabn = 7
a= 0,25 = 1/4
u7 = 16
a r⁶ = 16
r⁶ = 16 : a
r⁶ = 16 : 1/4 = 64
r = 2
panjang tali semula = s7 = a(r⁷ - 1) / (r -1)
s7 = 1/4 (2⁷ - 1)/(2 - 1)
s7 = 1/4 (128 -1)
s7 = 127/4
s7 = 31,75 m