What is the come ratio of the following geometric sequence 90,135/2,405/8

Which statement about perfect cubes is true

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

It is given that the quadratic equation hx²-3x+k=0, where h and k are constants, has roots [tex] \beta \: and \: 2 \beta [/tex]express h in terms of k