If P(6,-2), Q(-2,8), R(-4, 3), and S(-9, y). find the value of y so that PQ is perpendicular to RS.

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 two consexutive odd integers such that the sum of their square is 650

What is the measure of each of the two angles formed by the bisector of the diagonal of a rhombus if the original angle measures 58 degrees?