Which expression is equvailent to -4-9

-4+(-9)
4+9
4-9
-4+9

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that

How do you determine if an ordered pair is a solution to a given equation?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)