Which expression is equivalent to 8k - 4

Which of the following graphs could represent a cubic function?

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a

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.