An Al-Si alloy contains 30% primary band 70% eutectic microconstituent immediately after the eutectic reaction has been completed. Determine the composition of the alloy.

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

give me abc and i will get it for u.

answer; 4 electrons;