Which table shows a proportional relationship. i meed help

Solve the system of equations. y= 2x y= x^2 - 15

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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?