Can some pleas help with this 2 questions pleas pleas

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Why does his teacher ask him to balance the equation by including the correct coefficient

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?