First, you are going to want to get the terms to the same power of 10 in scientific notation. Realize that 
. Essentially, we have converted the 
to a term with 
. Now, we can subtract the values in each term that are not 10 as shown below:
Remember that we have to turn it back to scientific notation once we are done!
Our answer is the second choice, 
. (This is the closest answer to 
.)
Since the angle 225° is in the third quadrant, the reference
angle formula is Ar=Ac-180°. Ar = 225° − 180°
Ar=225°-180°
The reference angle is Ar=45°
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Yes, 13 is the remainder.
See dat pic for full solution.
