Tolong dibantu kak soal no 6,7,dan8 ya.... Question from @alifiarahayu03

mici14 7. -aritmatika-
Un = a+(n-1)b
u2 = a+b = 6
u7 = a+6b = 31
-------------------- -
-5b = -25
b = 5

a+b = 6
a+5= 6
a = 1

u40 = 1+39(5)
u40 = 1+195
u40 = 196

8. u3 = a+2b = 18
u7 = a+6b = 38
----------------------- -
-4b = -20
b = 5

a+2(5) = 18
a = 8

Sn = n/2 (2a+(n-1)b)
s24 = 12 (16+23(5))
s24 = 12 (16+115)
s24 = 12 (131)
s24 = 1572

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alifiarahayu03 mksh kak

ImmanuelSinaga $\text{No : 6} \\ \text{Bunga = 920.000 - 800.000 = 120.000}=\frac{120.000}{800.000}\times100 \ \text{Persen} \\ \text{Bunga = 15 persen} \\ \frac{\text{15 persen}}{9 \ \text{persen}}} \ \times \ \text{12 bulan} \ = \ \underline{20 \ \text{bulan}}$
$\text{No : 7} \\ U_{n} \ = \ a \ + \ (n-1)n \\ \text{Maka , didapat :} \\ U_{2} \ = \ a \ + \ b \\ U_{7} \ = \ a \ + \ 6b \\ \text{Eliminasi , didapat :} \\ \text{ b = 5 dan a = 1} \\ U_{40} \ = \ a + \ 39b \ = \ \underline{196}$
$\texT{No : 8} \\ \text{Dengan cara yang sama , dengan no 7, didapat :} \\ \text{a = 8 dan b = 5} \\ \text{Ingat :} \\ \boxed{S_{n} = \frac{n}{2} \ \times \ (2a + (n-1)b)} \\ \\ S_{24} = \frac{24}{2} \ \times \ (16+115) \ = \ \underline{1572}$

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alifiarahayu03 mksih bg

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