If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Summation notation


Consider the sum 4, plus, 25, plus, 64, plus, 121.
Which expression is equal to the above sum?
Choose all answers that apply: