Adam is 5 times as old as Charles. In 8 yrs the sum of their ages will be equal to twice Adam's present age. Find their present age.

Which of the binomials below is a factor of this trinominal? x^2-13+30

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

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?