Can someone please explain this to me

I'm not sure I understand either have you tried the hint or video button or did that help ?

ok so to answer this question you do 2xd d=8 so you would do 2x8 which is 16 then add 3 which is 19

Fraction division is basically multiplication of a reciprocal.

For example (1/4)/(1/8) = (1/4)x(8/1)=2

Multiplication of the answer and the piece that divides (in this case 2 x 1/8), you should get the piece that is being divided (in this case 1/4). If that is correct, then your division is correct.