Middle school math multiple choice

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.

Which shows one way to determine the facts of x3+4x2+5x+20 by grouping

Which graph shows the solution set of x^2+4-12x/> 0