Question

No 6-8 harap bantuannyaaa

Answer 1

Verified answer

6) U5 = 500
a + 4 b = 500
U12 = 850
a + 11 b = 850
( a + 4b ) + 7b = 850
( 500 ) + 7b = 850
' 7b = 850 - 500
7b = 350
' b = 350/7 = 50
a + 4b = 500
a +4.50 = 500
a + 200 = 500
a = 500 - 200 = 300
7) a = 100, r = 2, n = 3 jam /15 menit = 12
Sn = a ( r^n - 1 ) / ( r 1 )
S12 = 100 ( 2^12 - 1 ) / ( 2-1 )
= 100 ( 4.096 - 1 ) / 1
= 100 ( 4.095 )
= 409.500
8) a = 5, U6 = ar^5 = 1.215
5.r^5 = 1.215
r^5 = 243
r^5 = 3^5
r = 3
Sn = a ( r^n - 1 ) / ( r - 1 )
S6 = 5 ( 3^6 - 1 ) / ( 3 - 1 )
= 5 ( 729 - 1 ) / 2
= 5 x 364
= 1.820 cm



.

Answer 2

Verified answer

6.
U₅ = 500
U₁₂ = 850

Rumus cepat mencari beda



b = 50


500 = a + 4(50)
a = 500 - 200
a = 300
Jadi produksi telur hari pertama = 300 butir

7.
n = 3 jam = 3 x 60 = 180 menit
p = 180 : 15 = 12 kali
a = 100
r = 2


=>100 • 2¹²
=>100 • 4096
=>409600

8.

Rumus cepat rasio




r = 3

Maka




=>1820 cm