Answer: 4 .
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n/2 = 5 - 3 ;
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n/2 = 2 ;
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n = 2*2 ;
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n = 4 .
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By our very goofy system the circle constant 
denotes half a circle, 
. So the conversion factor from radians to degrees is
Calling the rightmost dot [1] and counting counterclockwise, that's dot [4].
That's dot [6]
That's dot [12]
That's dot [14]
Step-by-step explanation:
I'm sorry if my terminology isn't correct because I've learnt it slightly differently, but what I'm assuming is this:
For A, you can rewrite the integers as 28-15+22 as a + and a - next to each other result in a subtraction.
For B, you simply do 15+22 is 37 and 28-37 is -9 due to BIDMAS (or PEDMAS if you're American).
D move 2 times to the left
