When adding the components of a vector, the resultant magnitude is always the sum of the two component magnitudes. True or false?

Determine the maximum r-value of the polar equation r =3+3 cos 0

Why don't you see your reflection in water with waves or repples

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?