All changes saved A gaseous mixture made from 5.0 g of oxygen and 2.5 g of methane is place is a 15 L container at 25°C. What is the
partial pressure of oxygen?

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Precalculus question, image attached.

The moats separating people from the animals are 5 m wide for lions and 4 m wide for the elephants. if the lion’s moat is 4 m deep, how deep should the elephants’ moat be?