Graph the function.

f(x)=−sin(x)

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?

The area of square garden is 300m squared. how long is the diagonal?

If the value of cos330°is√3/2 then find cos 165°.