What is 2+2-3+7-9+23-6+78-34+89
what does that equal

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

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?

What is the product? a-3/15a × 5/a-3