In multivariable calculus, functions can depend on multiple variables. Evaluating these functions involves substituting ...

Reem Heakal is a writer who became an Investopedia contributor in 2003. Her writing covers a wide array of large-scale financial topics. Headquartered in Basel, Switzerland, the Bank for International ...

Andriy Blokhin has 5+ years of professional experience in public accounting, personal investing, and as a senior auditor with Ernst & Young. Erika Rasure is globally-recognized as a leading consumer ...

Dictionaries are deceptively simple, and incredibly ambitious. NPR's Don Gonyea talks to Stefan Fatsis about his book, "Unabridged: The Thrill of (and Threat to) The Modern Dictionary." It's a ...

Judy Ho, PH.D., A.B.P.P., A.B.P.d.N. Clinical Psychology / Neuropsychology / Mental Health Dr. Judy Ho is a triple board certified and licensed clinical and forensic neuropsychologist, a tenured ...

Every animal and plant needs food to live, and they are all part of a food chain. A food chain shows how animals obtain their food. A food chain also shows the flow of energy, which starts off at the ...

Photo: This family was awarded Honorable Mention, Large Family Class, as part of a eugenics exhibit at a Kansas fair in 1923. The term eugenics comes from the Greek roots for "good" and "generation" ...