Answer:
(5y−1)(y+1)
Step-by-step explanation:
Answer:
4(w - 9) or 4w - 36
Step-by-step explanation:

I hope I've helped you.
Answer: the third one
Step-by-step explanation:
The missing length is 12km (i never promised anything xd)
Answer:

Step-by-step explanation:
For this case we need a line parallel to the plane x z and yz. And by definition of parallel we see that the intersection between the xz and yz plane is the z axis. And we can take the following unitary vector to construct the parametric equations:

Or any factor of u but for simplicity let's take the unitary vector.
Then the parametric equations are given by:



Where the point given 
And then since we have everything we can replace like this:



