Step-by-step explanation:
A chef uses 2/3 cup of flour for every 1/8 cup of water in a dough recipe.
It means,
2/3 cup = 1/8 cup of water

Hence, the constant of proportionality is 0.1875.
Answer: its C
Step-by-step explanation: cause i did that already
Sin(4π/3)= -√3/2
cos(5π/6)= -√3/2