Can anyone solve all these for me really quick ?

What is the size of the matrix resulting from

The volume of a cube is 8 in to the 3rd power. how long is each side?

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.