Alaundry basket contains 18 blue socks and 24 black socks. what is the probability of randomly picking 2 black socks, without replacement, from the basket?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?