Ireally don't understand logarithms. i just need on how to do them. can you ?

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

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?