Answer:
30^-3
Step-by-step explanation:
Formula: When there are different bases and same exponents, multiply the bases, keeping the exponent the same.
3^-3 x 10^-3 = 30^-3
or
3^-3 x 10^-3 = 1/27 x 1/1000 = 1/27000 = 30^-3
