PLEASE HELP ON ANY WILL GIVE BRIANLIEST

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 equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side