Answer:
A) Particular solution:

B) Homogeneous solution:

C) The most general solution is

Step-by-step explanation:
Given non homogeneous ODE is

To find homogeneous solution:

To find particular solution:

Substituting
in (1)

Equating the coefficients

The general solution is

from (2) ad (3)

It is 15 meters long on each side.
You find the square root of 225 which is 15, because when you multiply 15 by 15 you get 225.
Please find the attachment for a better understanding of the explanation to this question.
As we can see from the diagram attached, the X axis represented by XX' and the Y axis represented by YY' intersect each other at the origin represented by O. Further, we notice that this intersection is at the angle 90 degrees or in other words the intersection is perpendicular. Thus, we have seen that the the x and y axes in the xy plane intersect perpendicularly. And hence, the answer is TRUE.
Please note that this is always the case and this is also known as orthogonality.