the exponent is 2, expressed as twenty, squared or 20 X 20.
20 with an exponent of 2 means 20 squared, or 20 times 20, or 400. An exponent of 3 means 20 cubed, or 20 times 20 times 20, or 8000. The exponents work as they do for any other base.
400
20 x 20 = 400
20 x 20
There are infinitely many possible answers. One such is 1*400
400, this isn't a good site to be doing your math homework on.
2^2 x 5 = 20
20 = 400
400
How about: 20*20 = 400
twenty times 20 x 20 = 400
Any size room where the length in feet times the width in feet equals 400. One example would be a 20' x 20' room.