neha

• Sep 30th, 2006

 

jus substitute t=4 in the equation n u will get 27

next substitute t=9 then u will get 34.5

34.5-27=7.5

sami

• Mar 6th, 2007

 

integrate it with limits 4 to 9 okay u will get the difference
or
substitute 4 and then 9 u can then use the necessary value
i don know which one is correct

Prajapati Ketan

• Mar 7th, 2007

 

In equestion  first put t=9,

we will get 34.5...........................(1)

now put t=4,

we will get 27..............................(2)

so ans=34.5-27

          =7.5

xxx

• Jun 11th, 2007

 

change the value 7.5 into percentage


(7.5/27)*100=27% high

pramod umakant bhat

• Jul 25th, 2007

 

Substitute the value given as time  i.e. 4 pm  and 9 pm in the given equation.
then find the difference
when t=9
-9^2/2 + 8*9+3=34.5

when t=4
- 4^2/2+8*9+3=27

finally
 
34.5 - 27= 7.5  (ans)