If 7 key chains cost $55.65 then 12 key chains cost

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking