Tolong dong PLISSSSSSS Saya kasih poin yang tinggi asalkan jawabnya yg bener........

Bab Pola Bilangan
Matematika SMP kelas VII

a] a = 3n
a1 = 3 x 1 = 3
a2 = 3 x 2 = 6
a3 = 3 x 3 = 9
a4 = 3 x 4 = 12

barisan yang terbentuk = 3, 6, 9, 12

b] b1 = (-1/2)¹ = -1/2
b2 = (-1/2)² = 1/4
b3 = (-1/2)³ = -1/8
b4 = (-1/2)⁴ = 1/16

barisan yang terbentuk = -1/2, 1/4, -1/8, 1/16

c] x1 = (1 + 1)/1 = 2/1 = 2
x2 = (2 + 1)/2 = 3/2
x3 = (3 + 1)/3 = 4/3
x4 = (4 + 1)/4 = 5/4

barisan yang terbentuk = 2, 3/2, 4/3, 5/4