James Durham runs an art gallery. He has several paintings from unknown artists that he has listed for sale. The paintings always sell at his weekly auction for $20,000 to $50,000 above what James believes them to be worth. James learns that the bidders at the auctions are employed by an olive distributor located near the shipping yards of the city. What concerns should Durham have about the art, the bidders, and the large purchase prices

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.

the radius is 2 times the diameter.

step-by-step explanation: