Will all parallelograms have diagonals that are lines of symmetry

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?

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?