How do you write a explicit formula from a word problem?

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

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?