Question

What is the difference written in scientific notation?1.3 x 106 - 6.8 x 1058.84 x 10-6.67 X 1056.2 x 105-5.5 x 10Done->

Answer 1

Step1: Write out the expression

$1.3\times10^6-6.8\times10^5$

Step2: Write both notations to have the same exponent

$\begin{gathered} 13\times10^{-1}\times10^6-6.8\times10^5 \\ 13\times10^{6-1}-6.8\times10^5 \end{gathered}$$13\times10^5-6.8\times10^5$

Since the exponent are now having the same powers, take the common factor

$\begin{gathered} (13-6.8)\times10^5 \\ 6.2\times10^5 \end{gathered}$

The third option is correct