36987

what other amounts of monry is it possible for alison to change her account balance by?
Any whole numbers
$2+$2-$3=$1
now we have $1 and $2
$2+$2+$2+$2-$3=$5; to make seven add $2 and to make a odd number (using this proccess you willl have all odd numbers)
To make even numbers ($2+$2...)
This method is called Proof by Echaustion

If Alison is only allowed to deposit $3 at a time and withdrawed $7 at a time, will she be able to change her account balance by any total?
7-3-3=1
3+3+3+3-7=2
3
3+3+3+3-7=5
(7-3-3=1) + (7-3-3=1) + (3+3+3-7=2) = 4
by using the methods of making 1-5 you can now make any number.