Mary made a withdrawal of d dollars from her savings account. her previous balance was $350, and her current balance is $280. represent this situation as a mathematical statement.

Anne is twice as old as bill, and bill is 3 years older than christie. the sum of anne s and christie s ages equal 72. find their age difference.?

What is the average rate of change for this function for the interval from x=2 to x=4 ?

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?