Tolong dong kk... nomor 16-20 please

16.
a: 30000 ; b: 8000
U14: 30000+(14-1)×8000 = 134000 (A)

17.
b: 4 kursi ; ada 15 baris ; a: 20 kursi
[tex]s15 = \frac{15}{2} \times (2(20) + (15 - 1) \times 4) \\ s15 = \frac{15}{2} \times (40 + 14 \times 4) \\ s15 = \frac{15}{2} \times 96 \\ s15 = 720 \: kursi \: (C)[/tex]

18. a: 120 kg ; b: 10
[tex]s10 = \frac{10}{2} (2(120) + (10 - 1) \times 10) \\ s10 = 5(240 + 9.10) \\ s10 = 5(240 + 90) \\ s10 = 1650 \: (D)[/tex]

19. n: 54 bagian ; a: 3cm ; U52: 105
a+51b= 105
a = 3
__________-
51b = 102
b = 2
[tex]s52 = \frac{52}{2} \times (2(3) + (52 - 1) \times 2) \\ s52 = 26 \times (6 + 51 \times 2) \\ s52 = 26 \times (108) \\ s52 = 2808 \: (B)[/tex]

20. b: 7000; u2= 12000
cari a dari u2 (a+b)
a+7000= 12000
a= 5000
U5= 5000+(5-1)×7000
U5= 5000+4×7000
U5= 5000+28000
U5= 33000

Semoga membantu

16. Jawaban Di Lampiran Gambar

17.
A = 20, b = 4
Sn = n/2 (2a + (n-1)b)
S15 = 15/2 (2x20 + (14)4)
= 15/2 (40 + 56)
= 15/2 x 96 = 720

18.
sn = n/2(2a+(n-1)b)
a = 120
b = 10
n = 10
s10 = 10/2(2.120+(10-1)10)
s10 = 1650 kg

19.
⇔ Sn = ⁿ/₂.[a + Un]

⇔ S₅₂ = ⁵²/₂.[3 + 105]

⇔ S₅₂ = 26 x 108

⇔ S₅₂ = 2.808 cm

20.
U5= 5000 + (5 - 1) × 7000
U5= 5000 + 4 × 7000
U5= 5000 + 28000
U5= 33000

#semogamembantu


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