The propriety is zero propriety. Because 0 times a number is 0
12 + 36 = 48
your answer is 48 inch
hope this helps
60 square feet = 8640 square inchs
So, 60 square feet = 60 × 144 = 8640 square inchs.
The correct answer of 1/3 is the decimal form of it which is 0.3 repeated (you can put a line on top of the 3). If not just leave it as 1/3 it is simplified as a fraction.
Your answer is -2 1/12. :)