A tank in the shape of an inverted right circular cone has height $ 10$ meters and radius $ 8$ meters. It is filled with $ 6$ meters of hot chocolate.

Question

Find the work required to empty the tank by pumping the hot chocolate over the top of the tank. Note: the density of hot chocolate is $ \delta = 1470 kg/m^3$

Answer 1

What do the $ signs mean before and after the numbers? What does $ \ mean in front of "delta"?

Does <$ 6$ meters> mean 6 cubic meters or a liquid height of 6 meters?