Answer: The answer here is 45* because all you need to do is 180-72-63 then BAM you get your answer :)
Unfortunately, Nicholas' steps in simplifying the fraction is not reflected in the question. However, the general idea of the simplifying fraction is to find the greatest common factor (GCF) of both the numerator and the denominator. In this case, the GCF is 10. Then, divide both numbers by the GCF. The answer for this item should be 2/3.
You have to find the value of c when b=4/3and a=6
I believe B is the answer