Final answer:
The equation x = 36 has one solution, p^2 = 42 does not have a real solution, and xw = 55 does not have a unique solution.
Step-by-step explanation:
The equation x = 36 has one solution, which is x = 36. The equation p^2 = 42 does not have a real solution because the square root of 42 is not a rational number. The equation xw = 55 does not have a unique solution because it involves two variables, x and w.