Can somebody solve this for meee? i don’t get it, thanksss

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?

Which will form a composite function?

What is the value for this expression? 2e-5