Simplify the expression. n+ 3(n + 1) = 0​

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

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