Find f(-3) when f(x) = -x²+1

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

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 two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16