Hi what is the circumstances 3rd to be

What is the most accurate measurement of 1 pound

Imagine a new pasture with grass growing on it. every day after the seeds have germinated, the number of blades of grass in the pasture triples. after 18 days, the entire pasture is completely covered in grass. how many days did it take for the pasture to be one-third covered in grass?

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area