Simplify

-3-20 divided by (-2*1)

Is the answer 7?

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 relationship between all triangles that can be drawn given the same three angles

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base