Question

How do you write the series `7+10+13+16+19` using summation notation?

Answer 1

`sum_(i=1)^(i=5) (4+3i)`

Explanation:

There are `5` terms thus `i=1 to 5`
with a common difference of `3` thus each term must contain a subterm `3i`
and the initial term is `4` more that `3i` with `i=1`