exam Maths Puzzle Numerical Ability

thank you for your help, please help me again,this is algebra from college math by blitzer.my first problem is this:

state the domain of the following: l(x) =2 +3 and the domain

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exam Other Question

In the expression 13y + 4 identify..

the variable____
the coefficient______ if (2,4) is the location of the centroid of a triangle. which CANNOT be the coordinates of the verticles of the triangle?
F= (0,0),(0,6),(6,6)
G=(3,4),(3,-2),(0,6)
H= (3,-2),(1,6),(2,8)
J= (2,0) ,(1,8),(3,4)