Problems

Estimate graphically $A(f)$ and $\xi$, such that $A(f) = f(\xi)$ for the following functions:

• $f(t) = (7 - 2t)$ on $[-2,3]$.
• $f(t) = (t^2 + t)$ on $[-1,2]$.
• $f(t) = \frac{1}{t}$ on $[1,2]$.