Step-by-step explanation:
x to the power of -a means (1/x) to the power of a.
so, 3^-3 = (1/3)³ = 1/27
and 10^-3 = (1/10)³ = 1/1000 = 0.001
1/27 × 1/1000 = 1/27000 = 0.00003703703703...
