Free points free points free points from me lol

What is the y intercept of f(x)=(1/2)^x?

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

Answer asap. you begin with 1/2 scoop of ice cream. since you're hungry, you ask the vendor for 2/7 more scoops of ice cream. then, you eat 5/8 scoops. how many scoops of ice cream are left on your cone? i will mark brainliest for first correct answer.