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Using the normal distribution, we got that expression for the z-score of her test score is
it's a type of probability distribution which is symmetric about the mean, it gives data near the mean are more frequent than data far from the mean.
Given that mean =
and standard deviation =
X=73
we know that formula of z-score is
Hence Z-score can be calculated as
Using the normal distribution, we got that expression for the z-score of her test score is
To learn more about the normal distribution visit : brainly.com/question/24663213
First we are going to group the terms that contains the common factor 
in one parenthesis, and the other ones in another parenthesis:
Notice that our the terms in our first parenthesis have a common factor, and the terms in our second one have the common factor 
. Lets factor those out:
Now we have a common factor
in both terms, so we can factor those out as well:
We can conclude that the completely factored expression ordered alphabetically is
.
Notice that our the terms in our first parenthesis have a common factor
Now we have a common factor
We can conclude that the completely factored expression ordered alphabetically is