This states that a number divided by 3 is 21. the equation is: n/3 = 21
2.0e-6
Is the answer to your question
F(x)=10-16/x
f'(x)=16/x^2
f'(c)=16/c^2
f(8)=10-16/8=10-2=8
f(2)=10-16/2=10-8=2

4∈[2,8] is the required point.
The difference is the inequality symbol instead of the = there is a < > replacing it