Question

What is the term a8 of the sequence {an} if an equalsa) 2n−1?b) 7?c) 1 + (−1)n?d) −(−2)n?

Answer 1

The correct question in the attached figure

case A) an=2^(n-1)
for n=8
a8=2^(8-1)-----> a8=2^7----> a8=128

the answer case A) is 
a8=128

case B) an=7
then for n=8
a8=7

the answer case B) is
a8=7

case C) an=1+(-1)^n
for n=8
a8=1+(-1)^8----> a8=1+1----> a8=2

the answer case C) is
a8=2

case D)an=-(-2)^n
for n=8
a8=-(-2)^8----> a8=-256

the answer case D) is
a8=-256