20 squared = 20^2
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20 squared = 20 x 20 = 400 400 in expanded form using exponents = (4 x 10^2) + (0 x 10^1) + (0 x 10^0)
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.
It means that the exponent is 2.
They're the same thing. The 2 in squared inches is an exponent.
202 = (22*5)2 = 24*52 = 2*2*2*2*5*5