Please please please help with this no links

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?

How many solutions does the nonlinear system of equations graphed bellow have?

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?