Answer:
I think true im sorry if its not
15+c=17.50
First you subtract 15 by 15 because you switch operations from adding to subtracting then you would put C under it
Second subtract 17.50 and 15 and that is 2.50 so C= 2.50
You subtract the intial from the final. your answer is0.94grams
87.41898806% or 87% is what i got
