This question looks like it may have some typos. Maybe try reuploading it?
A line is 180° so if you are given 43°on part of line l
180-43=137
So x=137°
The first one is "unit of account".
The second one is "store of value".
The third one is "medium of exchange".
The associative property never works with subtraction.
For example:
2 - (7-8) <span>≠ (2-7) - 8
2-(-1)=3, but (-5)-8=-13
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