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PinkGreeN · Jan 9, 2009, 09:35 PM

Biology: THe fish population in a certain lakes rises and falls according to the formula
F=1000(30+17t-t^2)

F is the number of fish at time t, where t is measured in years since January 1, 1992, when the fish population was first estimated.

a). On what date will the fish population again be the same as on January 1, 1992?
b) By what date will all the fish in the lake have died?:confused::confused:

Clough · Jan 10, 2009, 03:10 AM

Hi, PinkGreeN!

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galactus · Jan 10, 2009, 09:13 AM

Biology: THe fish population in a certain lakes rises and falls according to the formula
$F=1000(30+17t-t^{2})$

F is the number of fish at time t, where t is measured in years since January 1, 1992, when the fish population was first estimated.

a). On what date will the fish population again be the same as on January 1, 1992?

t=0 is the number of fish on Jan. 1 1992. Plug in t=0 into your given formula and find that value for the number of fish initially. Then, set your formula equal to that and solve for t.

b) By what date will all the fish in the lake have died?:confused::confused:

Set your formula equal to 0 and solve for t. There will be two solutions. Ignore the negative one.