What is the solution to the equation P over 9 equals 90

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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?

Does the point (1, sqrt 7) lie on circle shown.