Is 9, 16, 23, 30, an arthmetic sequence

What point is the projection of q on a) r b) s c) t

Find the area of the unshaded square

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.