R=8.4mi circumference to the nearest 10th with pi being 3.14

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

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅