in an experiment, you need 250 grams of potting soil for each of 10 plant samples. How many kilograms of soil in total do you ne
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For any square the area is given by 
where 
is the length of one side. (This comes from the general rectangle formula 
with 
).
To solve for we take the square root of both sides:
Now we can substitute known values:
To solve for
Now we can substitute known values: