Pleas help me with this answer

What are the sotions to the quadratic equation 9x^2=4

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?

Which graph represents the equation y =4x