Step-by-step explanation:
in a geometric sequence there is a constant factor x that is multiplied with every previous term to create the next one.
a2 = 20
a5 = 1280 = a2×x×x×x = a2×x³ = 20x³
64 = x³
x = 4
=> a1 = 5
therefore
an = an-1×4 =

n > 1
I believe that the answer would be B) y = x + 19
3+1=4
As all parents would teach their babies simple math...take three candies and take one more. How many candies do you have now? Four