Rectangle has an area of x^2-16 square meters and a width of x+4 meters

If i have one apple and give you the apple, how many apples do i have?

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?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?