a.) the number of terms

Question

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"

Answer 1

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.