# maths

posted by
**Michelle**
.

the volume of water in a tidal pool is given by the formula

V = 2cos (3pi/x ) where x is the depth of water in the pool.

Find the water at which the depth of the pool will be increasing when the volume in the pool is increasing at the rate of 12 cubic metres per hour and the depth is 1.2 metres.

THanks heaps!