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U4 ⇒ a + 3b = 29
3b = 15
b = 15/3
b = 5
subtitusikan
a + 3b = 29
a + 3(5) = 29
a + 15 = 29
a = 29 -15
a = 14
S15 = n/2 (2a + (n-1)b)
= 25/2 (2.14 + (25-1)5)
= 25/2 ( 28 + 120)
= 25/2 x 148
= 25 x 74
= 1850
jawabannya A