A(n) is a special type of hyphen that prevents two words separated by a hyphen from splitting at the end of a line.
I'm not sure if I get what you mean, because I don't think I remeber what an area model is. But if it literally means making a model to describe the area, you could draw a square and put 84 on the length or the width and the o.24 on the other. Show that length times width = area. And then multiply. But if I am right, that's not what you are looking for, huh?
Answer:
a, the following expression equals 13

Divide both the numerator and denominator by 9 to get;

Convert the improper fraction to a mixed number;