if a pebble is dropped into a pond in the shape of an ellipse at the location of one focus, the waves will converge at the location of the other focus. If the pond has a major axis of 68 feet and a minor axis of 32 feet, how far apart are the foci? (1 point)
In an ellipse, the distance between the two foci is equal to 2 times the distance from the center to a vertex along the major axis.
The distance from the center to a vertex along the major axis is half of the major axis length, so it is 68/2 = 34 feet.
Thus, the distance between the foci is 2 * 34 = 68 feet. Answer: \boxed{68}.