PLEASE ANSWER WILL MARK BRAINIEST IF CORRECT :)
1. What is the set of solutions for the following problems: Find all even integers divisible by 5.

The set of elements is { where where n∈ }

2. Find the following sets if ℤ is the universal set:

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters