Answer: I believe it is 60-10=x because it says she purchased it with 60$ but recieved 10$ in change causing the amount we dont know to be a variable such as "x"
Yes it does mean the whole fraction is negative
Applying pythagorean theorem:-





Answer:
611m²
Step-by-step explanation:
Too difficult to explain by words, it's in the picture.
Hope this helps!