Keeping in mind that "dx" is the delta x, or differential over the x-axis, whilst "dy" is the delta y or differential over the y-axis,
Answer:
D
Step-by-step explanation:
The 30-60-90 triangle has the shortest leg as x.
If there is no x you have to use the 2x or 
Your answer is d, or the fourth option! hope this helped!
I hate dividing fractions but I think -2/16 off of my best hunch.