Can someone help me with #9

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?

What is the factored form of the following expressions? d^2 – 13d + 36

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2