5g2 + 10g + 2
i think,,, it might be wrong
4(3) + 2(3-2)
4(3) + 2(1)
64 + 2
the answer is 66
The sum of a geometric sequence is:
s(n)=a(1-r^n)/(1-r), a=initial term and r=common ration so
s(n)=20(1-0.25^n)/(1-0.25)
s(5)=20(1-0.25^5)/(0.75)
s(5)=26.640625
Answer: on khan academy answer: 221
Step-by-step explanation: