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math doubts [NEW]

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slvri:
ok.....on tenth bday 1000 is put and on 18th bday it bcomes 1000(1.06)8 cuz for 8 years interest is put on it(on 11th to 18th bdays)
on eleventh bday 1000 is put and on 18th bday it becomes 1000(1.06)7 bcuz for 7 years interest is put on it(12th to 18th bdays)
and so on till on 18th bady 1000 is put but it stays 1000 bcuz thats the end of the time period
this forms a geomtric progression 1000+1000(1.06)+1000(1.06)2+.....+1000(1.06)8
a=1000, r=1.06, n=9(NOT 8!)
S9=1000(1.069-1)/(1.06-1)=$11491.32
is this correct?

slvri:
oh sory........then -63 is the minima cuz -63 is the value of the function when the value of x is 2

zara:

--- Quote from: slvri on November 14, 2009, 07:04:51 pm ---oh sory........then -63 is the minima cuz -63 is the value of the function when the value of x is 2

--- End quote ---
ayte! so if it was +63 then we say its the maxima?

slvri:
no....if theyve said itz a minimum point then 63 will still be a minima......
its not necessary that a minima is always negative....it can be positve tooo..
and a maxima can be negative

zara:

--- Quote from: slvri on November 14, 2009, 07:12:02 pm ---no....if theyve said itz a minimum point then 63 will still be a minima......
its not necessary that a minima is always negative....it can be positve tooo..
and a maxima can be negative

--- End quote ---
ohkay...thnkx..

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