Two monomials are shown below. What is the greatest common factor of these monomials? 12x5y3z2 and 42x3y2z

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?

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

I’m still confused on how to work the percentages