How can you use a random sample of a population to make predictions?

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Which of the following expressions is equal to 2x^2+8

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?