Consider the equation below. (If an answer does not exist, enter DNE.) f(x) = x3 − 9x2 − 21x + 6 (a) Find the interval on which f is increasing. (Enter your answer using interval notation.)

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.