[填空题]
The water in a pool is 67cc jezu7u, :x /7arwcxvls. being pumped out into a nearby lake at a 8kk bht)/)+pzjsjft; rate of r litres per seck8zt)hktj)j sfb p/+;ond where r=$\frac{2 t}{275}$ and t is time measured in seconds. The graph of this is shown below.
1. Find out how much water has been pumped out after 1 minute,We get V≈ L
2. Determine an expression for the volume of water that has been pumped out of the pool for any given number of seconds, s ;The volume of water that has been pumped out of the pool after s seconds can be expressed as
v=$\frac{a}{b}$s$^2$ (L) ;a= ,b= .
