The given population models for the trees is given as:

It is required to find which forest will have a greater number of trees after 20 years and by how many.
To do this substitute t=20 in the equations of the models:


Hence, forest A has a greater number of trees after 20 years.
Calculate the difference:

It follows that forest A has a greater number of trees than forest B by 43 trees.
After 20 years, forest A has a greater number of trees than forest B by 43 trees.
It is not enough to describe the oppostite rays only with the statement that they have the same endpoint. Besides the same endpoint opposite rays are characterized with opposite drection.
So, the student should answer: VW and VZ are opposite rays because they have the same endpoint and the the opposite direction.
Can you please post a photo or something so we can help you?!
where is the number line?