Question

4, 9, 19, 39, 79;159, ( x )

Answer 1

Answer:

319

Step-by-step explanation:

9 - 4 = 5

19 - 9 = 10

39 - 19 = 20

79 - 39 = 40

159 - 79 = 80

X - 159 = 160

so; X = 319

Answer 2

Answer:

319

Step-by-step explanation:

4*2+1=9

9*2+1=19

19*2+1=39

39*2+1=79

79*2+1=159

159*2+1=319