Typo error fixed.
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
Merge branch 'master' of git://github.com/openwebwork/webwork-open-problem-library
New problems.
Fix math and randomization error

Bug 2751
Add missing ENDDOCUMENT();

Fix bug 2757
Fix bug 2761, wrong answer
Fix bug 2763, precision problem in answer checking
correct rounding behavior for some cases: LoyolaChicago 1.4/Q38.