Question

HELP PLEASE NO LINKS!!!!!!!!!!!!!

Answer 1

9514 1404 393

Answer:

17.98

Explanation:

The sequence is geometric with first term a1 = 12 and common ratio r = 1/3. Put these numbers in the formula and do the arithmetic.

`S_n=a_1\cdot(1-r^n)/(1-r)\\\\S_6=12\cdot(1-(1)/(3^6))/(1-(1)/(3))=12\cdot(3)/(2)\cdot(728)/(729)=(1456)/(81)\approx\boxed{17.98}`