Question

question no.1 (vi). in below photo

Answer 1

an=a+(n-1)d

3.7=-13.6+(n-1)(2.2)

3.7+13.6=(n-1)(2.2)

17.3=(n-1)(2.2)

17.3/2.2=n-1

n=17.3/2.2+1

n=7.86+1

n=8.86

but n should be a integer so that the nth term given may be wrong