Ten years ago, a school with a fixed population decided to increase the size of its student body. The size of the student body t years since the increase began is given as s(t). It is known that the value of the definite integral from 0 to 10 of s'(t) is 400. Which is true?
The student body is now at 400.
The student body is increasing by 400 per year.
The student body grew by 400 students.
Nothing can be determined from this information.