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She can either drive 2 mph slower than the speed limit (ie at 45-2=43 mph) or 2 mph faster than the speed limit (ie at 45+2=47 mph)
So if 's' is her speed limit, then she must travel greater than or equal to 43 mph, which means that
. In addition, she must travel at most 47 mph which also means that
Combine the two inequalities to get
So the compound inequality is
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