What is the slope of the line on the graph?

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Which property is illustrated by the following statement? if hxa rgi, then rgi hxa.

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18 }, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.

Can anyone me get through my algebra 2 class? the only class i need to graduate..