4.2 × 10-4 written in regular notation is 0.00042
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46 = 4 x 4 x 4 x 4 x 4 x 4 = 4,096
x times x cubed is equal to x^4, or x raised to the power of 4.
x^(2-x-6)/x^(2-4) x^(-4-x)/x^-2(x^-2)*(x^(-2-6))= x^(-2-x)
4 x 4 x 4 x 4 x 4 = 1024
10