Find the constant sum for an ellipse with foci f1 (0, -12), f2 (0, 12) and the point on the ellipse (9, 0).

When turned about its axis of rotation, which shape could have created this three-dimensional object?

The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)

What’s the answer ? use the picture to see the problem