A living room is 1,400 cubic meters. If there are 3.6 x 109 particles of dust per cubic meter, how many particles of dust are there in the living room

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?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16