Can someone pls help me with this question

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?

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Which statement about perfect cubes is true