Which notation below best represents the sum of the first 10 terms of the arithmetic sequence {-1, 2, 5, 8,.}?

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

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?

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5