Question

what is the dofference written in scientific notation? 0.00067-2.3×10^-5

Answer 1

The number 0.00067 in scientific notation is

$67\times10^{-5}$

because we can move the point 5 places to the right:

Now, both numbers have the same power, then

$\begin{gathered} 0.00067-2.3\times10^{-5}​=67\times10^{-5}-2.3\times10^{-5} \\ then \\ 0.00067-2.3\times10^{-5}​=(67-2.3)\times10^{-5} \end{gathered}$

since 67-2.3 = 64.7, the answer is

$0.00067-2.3\times10^{-5}​=64.7\times10^{-5}$