An urn contains six red balls, five black balls, and four green balls. if two balls are selected at random without replacement from the urn, what is the probability that a red ball and a black ball will be selected. explain how to do it

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

For the equations below which statement is true ? -2x=14 6x=-42