For the problem in the upper left-hand corner, see the attached image "figure 1" for the steps and answer. The answer is -1/16.
For the problem in the upper right-hand corner, see "figure 2" for the steps & answer. The answer is -5/6
For the bonus problem at the bottom, see "figure 3". The answer is 27
If you have any questions about any of the steps, then please let me know.