Question

I will show you the pic

Answer 1

to determine the product between the 2 numbers we must write both numbers in scientific notation

$800.5=8.005\cdot10^2$

now we multiply both number without the tenth potency.

$8.005\cdot2=16.01$

now we add the tenth potencies

$\begin{gathered} 16.01\cdot10^{6+2} \\ 16.01\cdot10^8 \end{gathered}$

now we move 1 decimal place more to the left to make the number between 0 and 9.9

$16.01\cdot10^8=1.601\cdot10^9$