- Chemistry help please!?

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Chlorine is added to treated drinking water at a concentration of 2.1mg/L prior to distribution. If the average velocity in the distributio? L-9y-7+6=18 how to solve y? A body is acted upon by 4 forces in the image below, the resultant moment of the forces with respect to the point 0 is? Let θ be an acute angle of a right triangle for which sin θ = 12
13
. Find cos θ.? After I graduate Electrical enginnering school with a masters degree I must get a job because I m poor.How much money will I make?