How do i know if there are 2 triangles based on measurements?

Given the following similar triangles what is the area of triangle b ? a) 1 b)1.8 c)3.2 d)5

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?

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?