find four consecutive integers such that 6times the sum of the first and third is 12 greater than 9 times the fourth.

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?

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.