a filter filled with liquid is in the shape of a vertex-down cone with a height of 15 in and a diameter of 10 in at its open (upper) end. if the liquid drips out the bottom of the filter at a constant rate of 4 in3/sec, how fast is the level of the liquid dropping when the liquid is 1in deep?

In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.