Innermost orbitals have the least amount of energy
It's 12/35 because tangent is opposite over adjacent, so 12 is opposite of angle M and 35 is adjacent of angle M
If you want to remember cosine, sine, and tangent just remember
SOH CAH TOA
25 cubic inches because you know that every cone is a third of the volume of the cylinder with which it shares a height and base with.