What is the sum of this sequence

1 + 3 + 5 + 7 + ... + 999

Which point is a solution to the inequality shown in this graph (-3,-3)(3,-1)

Which of the following points is collinear with (-2,1) and (0,3)

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?