Ok, I have this word problem dealing with exponential growth and decay. I need serious help. There are three parts to this problem...I really need help with this. Here's the problem: A dilution is commonly used to obtain the desired concentration of a sample. For example, suppose that a 1 millilitre of hydrochloric acid, or HCl, is combined with 9 millilitres of a buffer. The concentration of the resulting mixture is 1/10 of the original concentration of HCl. a.) Suppose that this dilution is performed again with 1 millilitre of the already diluted mixture and a 9 millilitre buffer. What is the concentration of the resulting mixture (compared with the original concentration)? b.) Write an expression to model the concentration of HCl in the resulting mixture after repeating dilusions as described in part "a". c.) What is the concentration of the resulting mixture (compared to the orginal concentration) after 5 repeated dilusions? Ok, I don't even know what I'm supposed to find or how I'm supposed to find it. I tried this in class without any luck, unfortunately my calculations only took me as far as .1^.1. I don't even think thats right. Could someone please help me? I really need it. Thanks.