Help me somebody.​

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?

It says factor each expression completely 8y+48

Find the area of a parallelogram with base 15 yards and height 21 2/3