What is the chance of selecting a €1 coin from a wallet consisting of €3.00 worth of €1.00 and €3.00 of 50c

Which logarithmic equation is equivalent to the exponential equation below? e^a=55(you will receive 34 points)

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?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?