How do you do calculation monitoring

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 are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =