Posted by Dianne on Thursday, February 9, 2012 at 10:56pm.
A certain disease affects 9 out of every 10,000 Americans. In a city of 4.5 milion people, how many would you expect to have the disease.

algebra  Ms. Sue, Thursday, February 9, 2012 at 11:06pm
One way to solve this is with a proportion. Cross multiply and solve for x.
9/10,000 = x/4,500,000