Solveit

if it is like that it need to be

800×2x2=3200

but smth in me saying that it need to be harder 

Since the beginning of 2002,the number of student in Spring Lake high school has doubled every 3-year period. If there were 800 students in the school at the beginning of 2002,how many students are in the school at the beginning of 2008?

i think guest s answer is best

Systems of equations 

5x+3y=17

5x-2y=-3 

5x+3y=17

minus

5x-2y=-3

5x+3y-(5x-2y)=17-(-3)

5x+3y-5x+2y=20

5y=20

y=4

Thanks CPhill !

thanks Guest really ! I am already using that. 

http://web2.0calc.com/questions/help_36523

http://web2.0calc.com/questions/help_38119

S circle=pi x r^2

Thanks everybody! the answer is 3/5 we all misread the question :)

Thanks Guest really ! 

thanks IntagramModel your is better ;)