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point
is the vertex of the angle marked in the figure
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The comlete question with the diagram is in the picture attached.

Point     is the vertex of the angle marked in the figure.

Explanation:

When two lines intersect each other they will form an angle and the intersection point will be the vertex of the angle.

In the figure attached, the line that joins the points A and B and the line that joins the points C and D intersect at the point E, forming the corresponding angle (shadowed in the figure).

Such intersection point, which marks the angle, is the vertex of the angle.

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

2nd one in the first row is correct