Which of the following statements best describes the relationship between any point on an ellipse and each of its two foci?
A. The quotient of the distances to each focus equals a certain
constant.
B. The product of the distances to each focus equals a certain
constant.
C. The sum of the distances to each focus equals a certain constant.
D. The difference of the distances to each focus equals a certain
constant.

What is the mass of sodium in 3 moles of sodium chloride

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

Light waves can move through , but they travel fastest when they move through a(n) .