What are consecutive differences

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

With: label the vertices and all the elements needed. find x

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.