(2.5 x 10^6)(2.0 x 10^-2)

7.0 x 10^-2 / 5.0 x 10^9

(8.0 x 10^10)(4.0 x 10^3)

2.1 x 10^11 / 7.0 x 10^-3

6,000,000,000 x 0.0000000023

please you have to apply the rules of multiplication between powers with the same base. Then we have:

1) 4.5*10^(4)

2) 1.4*10^(-11)

3) 32*10^(13) = 3.2*10^(14)

4) 0.3*10^(14) = 3.0*10^(13)

5) 6*10^(9)*2.3*10(-9)=13.8= 1.38*10^(1)

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