Merge pull request #38 from paulvojta/master

Fix DBsection tagging of some Michigan problems
Solutions added/modified.
Fix bug 2810, incorrect answer
New function composition problem.
New function equation problems.
Fix keywords.
Identify annual factor and distinguish it from effective rate per year.
Remove sentence about ln or log being used in answer.
Reason: problem specifies "ln" and offering "log" will confuse some.

Note: this suggested change is independent of my disagreement about "log"
defaulting to be base-e logarithm in WeBWorK.
Merge pull request #39 from Dick-Lane/master

Identify annual factor and distinguish it from effective rate per year.
Merge pull request #40 from Dick-Lane/master

Remove sentence about ln or log being used in answer.
Remove statements about "answer must be inequalities" since it is false
(and mildly sub-optimal).
Replace "your graph" with "the graph of h" or "the graph of g".
Merge pull request #41 from Dick-Lane/master

Remove statements about "answer must be inequalities" since it is false
Fix bug 2789, tables need to be arrays in math mode
Fix bug (derivative evaluated at point outside of domain of function)
Fixed bug 2815, duplicate problem.
Duplicate problems
Improved wording
Duplicate problems
Duplicate problems