Applications of Differentiation - Interpreting Gradients and Concavity

The diagram below shows the curve \(y=\mathrm{{f}'}\left( x \right).\)

1. State the \(x\)-coordinates of the stationary points for the curve \(y=\mathrm{f}\left( x \right).\) Hence determine the nature of these stationary points.
2. State the maximal range of values of \(x\) such that the curve \(y=\mathrm{f}\left( x \right)\) is,
   1. concave downwards,
   2. strictly decreasing.