Consider triangle PQR. What is the length of side QR?

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?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

In the triangles, bc =de and ac fe. if the mzc is greater than the mze, then ab isdfelth