Divided 75000 by 10000 so it would be 7.5 square cm
The unknowns in this problem are A. The number of boys and the number of girls in the class.
We know there are 7 more girls than boys, but because we don't know how many boys there are, we don't know how many girls there are.
Answer:
does it tell you what x is?
What are the expressions? I can't help without them.