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In CAS mode, one can do a summations like sum(5*n+3,n,0,25) = 1703
But in the official Dutch Exam mode, CAS is disabled.

The TI-84 Plus CE-T has a very nice summation SIGMA( function that remains available in Exam mode.

I can't seem to find if there is a non-CAS equivalent to the sum() function?

There is a summation sign in the template menu (to the right of the toolbox) that works in the HOME screen (third entry in bottom row). Just remember to use a predefined variable (such as an uppercase letter).

Hello
With 2 functions:
ΣLIST(MAKELIST(5*X+3,0,25))

Sure there are other possibilities.

You find it in the mathematical templates
Σ(5*X+3,X,0,25)

Ha, the templates!
I'm not quite used to that button.
Magic.

Thanks, fellows.