I think it would be 2 soulutions
Answer: 
Step by step:

(Used a table of common angles)
You divide 690 by 100 which is 6.9
Therefore, one 50cent coin is 6.9g
Answer:
and
.
Step-by-step explanation:
The given expression is:
and
.
The least common denominator is:
.
We collect LCM for the denominator to obtain;
and
.
We multiply out the parenthesis to obtain;
and
.
Therefore the correct answer is B or the second option.
I think the answer is B. I hope I helped.