tlg jawab ya pliss bsk di kumpul ...

3. 4,16,28
a=4
b=12
un=a+(n-1)b
u24=4+(24-1)12
u24=4+276
u24=280
maaf jika jawaban saya salah
maaf hanya soal no 3 yg saya jawab
semoga bisa membantu

1. U2 = 16
U5 = 52
5x - 2x = 52 - 16
3x = 36
x = 12

U1 = U2 - 1*(X) = 16 - 12 = 4

U20 = U1 + (n-1)*x = 4+(19)*12 = 232


2. U1 = 4
b = 12

U8 = 4 + (7)*12 = 88
U24 = 4 + (23)*12 = 280

U8+U24 = 368


3. S24 = ½ N * (U1 + U1 + (N-1)*b)
= 12 * (8 + 23*12) = 12 * 284 = 3.048


4.
a. 1/4 , 2/4 , 4/4 , 8/4 , 16/4 , 32/4
b. -14 , -10 , -6 , -2 , 2 , 6