32 pages minus 28 pages equals to 4 pages
XY - X + 2Y -2 =X(Y-1) + 2(Y-1) = 2X(Y-1)
3)
Now, use Pythagoras theorem to find x

Similarly,
4)
Now, use Pythagoras theorem to find b

You can solve all of them in a similar way.
: )
I think is would be $25.04. I'm sorry if i get this wrong. I am only a middle schooler. Sorry if this didn't help.<span />
A-b = 43----(1)
a+b = 13----(2)
(1)+(2) 2a=56
then a=56/2= 28
so b=13-28= -15
so that the numbers are -15 and 28