A 2.5-ft wide circular track for a camera dolly is set up for a movie scene. The two rails of the track form concentric
circles. The radius of the inner circle is 50 ft. How much farther does a wheel on the outer rail travel than a wheel
on the inner rail of the track in one turn?

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?

Find the solution of each of the following.