1. diketahui barisan aritmatika -4,-16,-28. tentukan b,u10 dan banyak suku (n) 2. diketahui barisan aritmatika 2,5,8,11. tentukan b,u10 dan banyak suku (n) 3. d

1. -4, -16, - 28
b = U2 - U1 = -16 - (-4) = -12
U10 = a + (n-1) b
U10 = -4 + (10-1) -12 = -4 + 9 × -12 = -112
banyak suku = 3

2. 2, 5, 8, 11
b = 5 - 2 = 3
U10 = 2 + (10-1) 3 = 2 + 9 × 3 = 29
banyak suku = 4

3. 28, 24, 20, 16
b = 24 - 28 = -4
U10 = 28 + (10-1) -4 = 28 + 9 × -4 = -8
banyak suku = 4


semoga membantu :))