Here you go hope this helps!
18 squared is 324, not sure if you are supposed to simplify it i'm guessing maybe. If yes then it is 3
√
2 or 4.24264068... If not well obviously 324 is greater than 5.
So the answer would be ( > ) because 5 is bigger than 4.24....
It would take him an hour
12x >9(2x-3)-15
distribute
12x> 18x-27-15
combine like terms
12x>18x -42
subtract 18x from each side
12x -18x >18x-18x-42
-6x>-42
divide by -6 which will flip the inequality
-6x/-6<-42/-6
x<7