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Amish-English sleuthing duo Deborah Yoder and Callie Harper set out to solve a murder. But more than an innocent man’s future is at stake. In book two of the

Understanding Mathematics is a carefully written series of mathematics to help students encourage the study of mathematics in the best interactive form. It cont

Twenty-three GRE Math Tests! The GRE math section is not easy. There is no quick fix that will allow you to "beat" the section. But GRE math is very learnable.

Jamshīd al-Kāshī’s Miftāḥ al-Ḥisab (Key to Arithmetic) was largely unknown to researchers until the mid-20th century, and has not been translated to E