Tính thuế này giải sao ạ

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

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 ?