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S=1+(3²-2²)+(5²-4²)+...+(2003²-2002²)
S=1+5+9+13+17+...+4005
S=1+(1+4)+(1+4+4)+...+(1+4*2002/2)
S=1+(5+4005)*1001/2 (from 5 to 4005 we have 1001 items, 5+4005=9+4001=4010
S=1+2007005 , we have 1001/2 4010s.)
S=2007006
the area of the rectagular is 4608.
It must be 0, from my intuition.
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Zell
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it's easy, try to read your text book carefully! you can solve this problems smoothly next time.
3x+5=8
> 3x=8-5=3
> x=3/3
> x=1
I'm not very sure about your problem.
but, I tried, maybe this is what your want.
100*(100-20)%=80
you have 4 students above 80.
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