Geometric is
an=nth term
a1=first term
r=common ratio
n=which term
commmon ratio is like
a1 times r=a2
4 to 8
4 times 2=8
r=2
first term is 4
therefor
the nth term is
an=nth term
a1=first term
r=common ratio
n=which term
commmon ratio is like
a1 times r=a2
4 to 8
4 times 2=8
r=2
first term is 4
therefor
the nth term is