Triangles thank you :)

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’s 8y+48 and factor each expression completely

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie