(4.3 x 10^3)(2 x 10^-8)

Answer 1

to do this, first we multiply the 1st terms or the number with no exponent (not the terms with 10 raised to an exponent). thus:
4.3*2 = 8.6
now we multiply the 2nd terms,, recall that if they have the same base (here, the base is 10) we can simply add the exponents:
10^3 * 10^-8 = 10^(3-8) = 10^(-5)

now multiplying the answers we got:
8.6 * 10^(-5)

hope this helps~ :)

Answer 2

4.3*10^3 * 2*10^-8=

4.3*2*10^3*10^-8=

8.6*10^[3+(-8)]=

8.6*10^(3-8)=

8.6*10^-5=

8.6/10^5=

8.6/100,000=

0.000086