4th root of a^8+b^4+c^12

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

Can someone me with this problem i don't understand i need

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.