tolong dibantu jawab ya

23).

U12 - U7 = 30
11b - 6b = 30
5b = 30
b = 30/5
b = 6

Tentukan Nilai a
U8 = a + 7b
44 = a + 7(6)
44 = a + 42
44 - 42 = a
2 = a

Maka,
U15 = a + 14b
U15 = 2 + 14(6)
U15 = 2 + 84
U15 = 86

JAWABAN C✔

24).

S20 = 440
a = 3
DItanya U20

Jawaban

[tex]s20 = \frac{n}{2} (a + un) \\ 440 = \frac{20}{2} (3 + un) \\ 440 = 10(3 + u20) \\ \frac{440}{10} = 3 + u20 \\ 44 - 3 = u20 \\ 41 = u20[/tex]
Jawaban B