-sqa(3.24-sqa(1.44+sqa(12.25)))
= -sqa(3.24-sqa(4.94)) (since sqa(1.44+sqa(12.25))=sqa(4.94))
=-sqa(3.24-2.22261)
= - sqa(1.01739)
= - 1.00866
Answer: 
Step-by-step explanation:
You know that "Z" is the midpoint of "YA". This means the following:

Now, you know that the expression for "YZ" is:

And the given expression for "ZA" is:

Knowing these expressions, you can substitute them into
, as following:

Finally, you must add these expressions in order to get "YA".
Therefore, this is:

You have to give the choices.
The sum us 15. Hope this helps.