Question

kak tolong bantuanya jawaban mtk!!!​

Answer 1

7, 10, 13, 16, ...

Asumsikan,

70 = an

b = an - a(n-1) = 10 - 7 = 13 - 10 = 16 - 13 = ... = 3

Maka,

70 = a + ( n - 1 ) b

70 = 7 + ( n - 1 ) 3

70 = 7 + 3n - 3

70 = 4 + 3n

66 = 3n

∴ n = 22 ( A )

Answer 2

Jawaban:

A. 22

Penjelasan dengan langkah-langkah:

7, 10, 13, 16,.....

mengikuti barisan aritmatika sehingga

a = 7

b = 10 - 7 = 3

Un = a + (n - 1)b

70 = 7 + (n - 1)(3)

70 - 7 = (n - 1)(3)

63 = (n - 1)(3)

n - 1 = 63/3

n - 1 = 21

n = 21 + 1

n = 22