General

Is it illegal for a school to not have a subsitute teacher assigned to a class when the teacher is not going to be in for the day and students just show up to class and no teacher apears for the whole class? Is that legal?

That portion of the earth in which living organisms are found?

For the above responses: idk how do you conclude that 'if a|b and a|c ⇒ a|(b+c)'. The general true statement is 'if a|b and a|c ⇒ a|(bx+cy)'.