Answer:
Rational
Step-by-step explanation:
Give brainliest or at least a thanks please!
The instructor wants the profit to be positive, so
f(n) > 0
70n -400 > 0
n - 400/70 > 0
n > 5 5/7
The instructor must enroll at least 6 students to make a profit.
19 mathematically
21 if you want a joke