-5/2 is equivalent to -2.5, and if you multiply 2.5 by 2 you get 5, and you have to have the negative, so add that to the 5 and you get -5. Hope this helps!
You just take the difference between them and the answer is 1 3/5
31 is the answer because you would do 5 x 3 an that's 15 and if it's squared u technically add 15 a second time
I believe it should be 22½ or 22 books
You would need to divide 18 and ⅘
18 ÷ ⅘ = 22½
I hope this helps, even though I’m not totally sure :)
