# More MathPractice

From UBC Wiki

This article is part of the MathHelp Tutoring Wiki |

## Rates

**Q** Liquid is being poured into a parabolic bowl at a constant rate of . The volume of the bowl is given by , where the equation of the parabola is , where y is the height of liquid in the bowl. Find the rate of increase of the height of the liquid in the bowl when the height is 10 centimetres.

**A** We can write Volume

is .

So, when y=10, we can evaluate which is the rate of change, which evaluates to be 6cm/s.