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Verified answer
Jawab7.
n = 30
a = 3
u30 = 61
panjang tali = 1/2 n ( a + u30)
p= 1/2 (30) (3 + 61)
p = 960
9.
7x + 5y = 4
5y = - 7x + 4
gradien = m = - 7/5
9:-7/5
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