mohon bantuannya kakak....???

b = (27 - 19)/(11 - 7).
b = 8/4.
b = 2.

a = U7 - 6b.
a = 19 - 6(2).
a = 19 - 12.
a = 7.

Un = a + (n - 1)b.
U15 = 7 + (15 - 1)2.
U15 = 7 + (14)2.
U15 = 7 + 28.
U15 = 35.

Jawaban : C.

Jawabannya C
Semoga membantu