Answer:
125.99/100 X 108 = 136.0692
round to 2 dp = $136.07
Well here : 5 times 9 = 45 and 7 times 7 = 49 so it would be 45/49!
There is no sum for this geometric series. it diverges rather than converges due to the absolute value of the common ratio (r), which is -3, being 3. for a geometric series to have a sum (to converge), the absolute value of r must be less than 1.
(you find r by dividing a2/a1, a3/a2, etc.)
hope this helps