Answer:
The boundary equation is 400 ≤ x ≤ 700 .
Step-by-step explanation:
Let x represents the wavelength in nanometers.
Maximum wavelength to have visible lights: 700 nanometers
Minimum wavelengths to have visible lights: 400 nanometers
The inequalities for these two boundary conditions would be:
400 ≤ x ≤ 700 nanometers
The absolute value equation would be:
|x -400| > 0
|x -700| > 0