is a valid argument
is not a valid argument
For the first argument: 
From the definition of absolute value function
if 
That is every positive number is its own absolute value. Since
,
we can argue that
so the first argument is valid
For the second argument: 
From the definition of absolute value function

This means that

or

no part of the definition allow for the option
. So the second argument is not valid.
Learn more here: brainly.com/question/11897796
It would be written as:
5.65 *10^-4
Remember, when writing scientific notation for a decimal, the power of 10 is always negative. In this case, since we're basically moving the decimal point for places to the right, the power of 10 is -4
Hope this helped! :)
There are 150 teachers because 20 * 150 is 3000.
Ones,tenths,hundreths, thousands,tenthousands,hundredthousands