How do you find the height of a cone when given the slant height and radius? Is there a formula I use to input numbers and then solve?

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 property is illustrated by the following statement? if hxa rgi, then rgi hxa.

What is the value of x when x + 7 = 21?