Number missing! Replace the question mark

Question

A number is missing. Find "?".

((13 19 4□)⁽⁷ ⁴ ⁻¹⁾□) + ((14 6 4□ 3□ 5)⁽⁶ ² ² ⁻⁴ ⁾□) + (4□ 13 12 5 23 5)⁽⁴ ¹⁰ ⁻⁷ ⁷ ⁻¹ ⁾ = ?□

Answer 1

If we

interpret □ as meaning, naturally enough, "squared", and
interpret exponentiation as meaning "add correspondingly-placed numbers", and
then interpret via A1Z26,

we get

TWO squared + THREE squared + TWELVE = ? squared

so, given that we're asked for a number, we should replace the question mark with

5.

Though I wonder whether actually something more like

(9 13 3□ 10)⁽⁻³ ⁻⁴ ¹³ ⁻⁵⁾

would be more appropriate.