If f(x) is differentiable in the interval [2,5], where f(2)=15 and f(5)=12, then there exists a number c, 2<c<5 for which f′(c)=
If f (x) is differentiable in the interval [2, 5], where f (2)=15 and f (5)=12, then there exists a number c, 2 < c < 5 for which f ' (c) is equal to