Need a answer for all of them

What is the value of p in the equation y^ = -4x?

What is the slope of (0,32) and (100,212)

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30