Tiny trevor finds he weighs 300N. what is his mass

Please show the steps I’m so confused

What can you increase the strength of an electromagnet by

Diverging mirrors and lenses always produce images

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?