Idk you should look it up on google and see if that would help you !!
The third one is r=-10 (don't forget the negative!)
The fourth one is p=-3 (again, watch for the negative)
((I can't get the fifth one, sorry. You might want to repost another question with just that one))
The sixth one is w=35.
Hope this helped a little bit! Sorry I couldn't help with all of them .-. Good luck though!
In this question, it is given that
The population of a particular village can be modeled by the equation

where x is the number of years since 1990.
And we have to find in what year were there 1706 people living in the village?
So we put 1706 for y and solve for x. That is

Subtracting 56 from both sides.

And 1990 +15=2005
Therefore in 2005, there were 1706 people living in the village
The mathematical term meaning " a parabola highest point " is the Vertex.
It is 1/6 or .16 I used Photomath