Please help with question 2-6! no one wants to help me out

What is the simplified expression for 6(2(y+x))

When is g(x) = 0 for the function g(x) = 5.23x + 4?

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.