a.) the number of terms
b.) the first term
c.) the last term
d.) evaluate the sum
5
E (3+n)
n=1
8
E 2n/3
n=1
I don't know what the symbol is for the equation but it looks like an "E"
It's a capital Sigma: ∑
What's the trouble? These look pretty straightforward. Plug in a value for n to get any term.
Add up the values to get the sum.