What is the solution to in (x^2-16)=0

Average acceleration: i have no idea how to do this.

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?

Can some one explain this i got sent this. is this a threat i’m scared