Asubmarine at the water's surface dropped down 100 ft after thirty minutes at that depth it dove an additional 500 ft what was its depth after the second dive

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.