ALGEBRA 2 HELP
(Please show work!)
A student wrote the arithmetic series 8 + 11 + ... + 29 in summation notation as (picture below)
a. Describe and correct the error in the notation.
b. Evaluate the corrected summation of the arithmetic series above.

c. Write the explicit and recursive formulas for the arithmetic series above,
Explicit:

Recursive:
If

Then for n > 1