Answer
5 $\times$ $10^{-5}$
Work Step by Step
You have the expression $\frac{4.5*10^3}{9*10^7}$. Evaluate the expression:
$\frac{4.5*10^3}{9*10^7}$=0.5$\times$$10^{3-7}$ -subtract the exponents and divide powers with the same base-
0.5$\times$ $10^{-4}$ -it has to be a whole number so move the decimal and subtract 1 from the exponent-
=5 $\times$ $10^{-5}$
