4.2475 rounded to the nearest ten or hundred

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?

Use the knowledge of x- and y- intercepts to choose the correct graph of the equation 3x+6y=6

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.