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Answer:
Subscripts and superscripts (such as exponents) can be made using the underscore _ and carat ^ symbols respectively.
Symbol Command Symbol Command
$2^{2}$ 2^2 $\textstyle a_i$ a_i
$\textstyle 2^{23}$ 2^{23} $\textstyle n_{i-1}$ n_{i-1}
$a^{i+1}_3$ a^{i+1}_3 $x^{3^2}$ x^{3^2}
$2^{a_i}$ 2^{a_i} $2^a_i$ 2^a_i
Notice that we can apply both a subscript and a superscript at the same time. For subscripts or superscripts with more than one character, you must surround with curly braces. For example, x^10 produces $x^10$, while x^{10} produces $x^{10}$.