Which summation formula represents the series below?
5 + 7 + 9+ 11
Ο Ση+ 2)
h=5
Ο Σ2n+ 5)
n=0
ο Σ(2n+ 5)
η=1
Ο Σ(n+ 2)
η=3

2n+5 with n=0 because if you replace the first value (0) you get a 5, then a 7, then a 9...

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post