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Verified answer
Bab Barisan dan DeretMatematika SMP Kelas VIII
U2 = 9.000
U10 = 13.000
b = (U10 - U2) / (10 - 2)
= (13.000 - 9.000) / 8
= 4.000 / 8
= 500
U1 = a = U2 - b
= 9.000 - 500
= 8.500
Sn = (n/2) x (a + Un)
S10 = (10/2) x (8.500 + 13.000)
= 5 x 21.500
= 107.500 buah
jawabannya D