What does 9 x 9 x 9 x 9 in standard form?

Answer 1

The answer is 9^4 (9 to the 4th power.)

OR

Standard form may also refer to factoring, in which case it is (9x9)(9x9); which, through FOIL (First, Inner, Outer, Last), would still give you the simplified answer of 9^4.

Standard form in Algebra, or graphing, is much different and involves moving all variables to one side and all constants to the other...but you don't have variables so I'm going to assume you aren't asking for that kind of standard form.