64x squared y cubed + 8xy divided by 4xy squared

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?

What is the range? can’t seem to find it out

Identify the number 127 as a rational or irrational. explain