Problems 14, 18, 21, 27.
Solve these problems “by hand”, but check your answers using Sage.
See the worksheet at
(You may have to copy and paste the whole two-line address into your browser).
Problems 10, 18, 19 (for part (b) do not draw the phase portrait; just the the direction field), 22
For drawing vector and direction fields see the worksheet:
(You may have to copy and paste the whole address into your browser).
Problems 6, 10, 11, 16 (use your answer from problem 11)
For problems 6, 10, 11, do not draw the phase portrait.