-9 is a rational number.
Answer: 469762048
Step-by-step explanation:
1: 7*4^0=
7*1=7
2:7*4^1=
7*4=28
3: 7*4^(3-1)=
7*4^2=
7*16=112
14: 7*4^(14-1)=
7*4^13=469762048