At train has 3 engines 52 boxcars and 1 caboose at every stop , it picks up 8 more boxcars . how many total cars engines cars and cabooses will the train have after 5 stops

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?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Can you me find the missing length. i attached an image.