Question: 1. An interval where the best possible bounds for f(x) = x2 are 2 ≤ f(x) ≤ 5.
2. A differentiable function f with best possible bounds -1 ≤ f(x) ≤ 1 on the interval -4 ≤ x ≤ 4.
3. The sum of two nonnegative numbers is 100. What is the maximum value of the product of these two numbers?