How do I do this ?...

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?

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?