Marcus has x songs downloaded on his phone. he downloads 20 more songs to his phone. enter an expression into the box to represent the number of songs marcus now has on his phone.

Abag contains 5 red marbles , 6 blue marbles and 4 green marbles. susie selects a marble and returns it to the bag before selecting another marble. if susie selects a red marble 6 out of 20 times, what is the experimental probability that the next marble she selects will be a red marble ?