Question

the 2nd and 5th terms of a go are -7 and 56 respectively. find the
common ratio
first term
sum of the first five terms?

Answer 1

ar^4/ar = r^3 = 56/-7 = -8
So, now you have a and r, so you just need
5(r^5-1)/(r-1)

Answer 2

wrong

Answer 3

wrong sir