Question 1094521
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I'm assuming the equation is {{{D = (4500x)/(x^2+32)}}}. If so, then we replace D with 375 and solve for x.


{{{D = (4500x)/(x^2+32)}}}


{{{375 = (4500x)/(x^2+32)}}}


{{{375(x^2+32) = 4500x}}}


{{{375(x^2)+375(32) = 4500x}}}


{{{375x^2+12000 = 4500x}}}


{{{375x^2+12000-4500x = 0}}}


{{{375(x^2-12x+32) = 0}}}


{{{x^2-12x+32 = 0}}}


{{{(x-8)(x-4) = 0}}} Note: -8 and -4 add to -12 and multiply to 32


{{{x-8=0}}} or {{{x-4 = 0}}}


{{{x = 8}}} or {{{x = 4}}}


So if you're at a distance of 4 miles or 8 miles from the city center, then the population density will be 375 people per square mile. 


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Yes it is possible to improve with math even late in life. Keep practicing whenever and however you can. Try to connect it to your everyday life. Connect it with something you know very well and you're passionate about. Math is in just about everything so it's bound to be related to your job or hobbies somehow. The more ingrained it becomes, it should come more natural to you. In a sense, math is a language that you need to practice (in similar ways that any foreign language is) to become fluent in.
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