Let a set A={a, b,c} and R={(a, a),(a, c),(b, c),(c, c),(b, b),(a, b)} be a relation on A. Then: Construct a matrix of R. Check whether R is a reflexive, a symmetric, or a transitive relation. Justify your answer with proper reasoning.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

Se tiene en una caja de canicas 10, 4 blancas y 6 negras ¿cual es la probabilidad que en 2 extracciones con reemplazo sean blancas? ¿cual es la probalidad que en 2 extracciones sin reemplazo sean negras?