Historical clue formulations

• Neighbor of Niger: Abbr. — 2024-09-08
• Land on the Med. — 2022-04-09
• Calculus prerequisite: Abbr. — 2021-09-04
• Quadratic formula subj. — 2021-03-28
• H.S. math class — 2020-01-07
• North African land: Abbr. — 2018-09-02
• Class with many unknowns: Abbr. — 2016-05-25
• What factoring is a factor in: Abbr. — 2015-08-08
• "Solve for x" subj. — 2014-05-05
• Some H.S. math — 2013-12-22
• Typical prerequisite to geom. — 2013-11-20
• N. Afr. nation — 2013-07-18
• "Solve for x" subj. — 2012-08-22
• 7x - 6 = 2x^2 subj. — 2012-06-10
• Math subj. — 2012-05-15
• Course with many unknowns: Abbr. — 2012-02-08
• N. African land — 2011-07-21
• Class with many functions: Abbr. — 2011-02-02
• Medit. land — 2010-12-29
• Geom. prerequisite — 2009-07-21
• 2x + 5 = 15 subj. — 2009-07-13
• Subj. with unknowns — 2009-02-18
• It involves many unknowns: Abbr. — 2008-03-21
• H.S. subject — 2008-03-01
• Neighbor of Libya: Abbr. — 2007-09-13
• Some H.S. math — 2006-11-19
• Calc. prerequisite — 2006-09-03
• High sch. math — 2006-08-23
• Math subj. — 2006-07-27
• Math subj. — 2006-07-20
• It's full of x's: Abbr. — 2006-06-10
• Search for the unknown?: Abbr. — 2006-05-24
• H.S. class — 2006-04-23
• H.S. subject — 2005-09-29
• Follower of arith. — 2005-02-06
• Afr. country — 2004-10-07
• H.S. math — 2003-08-06
• Math. class — 2003-06-19
• High school math: Abbr. — 2003-01-13
• H.S. class — 2002-04-24
• H.S. class — 2002-01-19
• H.S. math — 2001-09-18
• H.S. math — 2000-10-22
• H.S. subject — 2000-06-25
• H.S. subject — 2000-05-05
• Junior high subj. — 1999-04-25
• Math. course — 1999-01-06
• H.S. math — 1998-03-17
• H.S. math — 1997-11-26
• Math branch: Abbr. — 1997-11-23