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You can model the populationof a certain city between the years 1995 and 2000 by the radical function P(x) = 55000 sqrt(x - 1945). Using this model, in what year was the population of that city 275,000? a. 1970 b. 1966 c. 1964 d. 1975

Mathematics
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\[275000=55000\sqrt{x-1945}\] calc x
Would I subtract 55000 from 275,000?
no divide both sides by 55000

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Other answers:

|dw:1357766515232:dw|
Do u know the 'BODMAS' concept ?
so \[5 = \sqrt{x-1945}\]
No, I only know PEMDAS
The 'BODMAS' concept tells u the order u should follow when simplifying. The order is from top to bottom. B= Brackets ( ) O= Of D= Divide M= Multiplication A= Addition S= Substraction
Okay, but if there is a square root sign, like this one, then how do I know what to do?
square each side now
\[5^{2} = (x-1945)^{2}\] right ?
so \[25 = x - 1945 ?\]
no... squaring the ride side gets rid of the square root
well yes 25=x-1945 *u had it written different 1 comment b4*
Oh sorry, then would I add 1945 to 25 and then it will give me x ?
So x = 1970 ? so the answer would be A ?
yes
Okay thanks for your help! (:

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