You just want to subtract!
843.92-937.76= -93.84
he had a balance of -$93.84 left
(a/b) times (c/d)=(ac)/(bd)
16=16/1
(3/8) times (16/1)=(3 times 16)/(8 times 1)=48/8=(2/2)(2/2)(2/2)(6/1)=(1)(1)(1)(6)=6
answer is 6
[ Answer ]

[ Explanation ]
Y = X + 2 is saying that Y, is the X dot + 2.
When the X dot is on 0, we have to add 2 to get to where the Y dot is. X (0) + 2 = 2. That is where the Y dot is.
X (2) + 2 = 4. 4 is where the Y dot is,
Once you keep adding the X dots to 2, you will get the Y dots. That is why the equation is Y = X + 2. In order to get to Y, you need to add 2 to the X dot.
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12345678, 87654321, 98765432, 23456789, 54789021
These are random numbers but are possible answers to the question