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enot [183]
3 years ago
7

Biologists want to know how many fish are in a certain lake. On January 1, they removed 430 fish from the lake and tagged them.

On February 1, they returned to the lake and collected a random sample of 310 fish, of which 100 had been previously tagged. Based on this experiment, approximately how many fish are in the lake?
Mathematics
1 answer:
irina [24]3 years ago
6 0
The answer is 640 fish
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D-10-2d+7=8+d-10-3d
TEA [102]

Solution,solve\:for\:d,\:d-10-2d+7=8+d-10-3d\quad :\quad d=1

Steps:

d-10-2d+7=8+d-10-3d

\mathrm{Subtract\:}d-10\mathrm{\:from\:both\:sides},\\d-10-2d+7-\left(d-10\right)=8+d-10-3d-\left(d-10\right)

\mathrm{Refine},\\-2d+7=8-3d

\mathrm{Subtract\:}7\mathrm{\:from\:both\:sides},\\-2d+7-7=8-3d-7

\mathrm{Simplify},\\-2d=-3d+1

\mathrm{Add\:}3d\mathrm{\:to\:both\:sides},\\-2d+3d=-3d+1+3d

\mathrm{Simplify},\\d=1

\mathrm{The\:Correct\:Answer\:is\:d=1}

\mathrm{Hope\:This\:Helps!!!}

\mathrm{-Austint1414}

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The two consecutive odd integers are 57 & 59.
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At a pet shop 5 herbals out of 15 have black hair and 3 mice out of 9 have black hair. Are the ratios the Same?
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Step-by-step explanation:

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5 : 15

Simplify (divide both sides by 5)

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Simplify (divide both sides by 3)

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