the number N of state and federal inmates in millions during year x, where x ≥ 2002 can be approximated by the following formula. N=0.05x - 99.25 determine the year in which there were 1.1 million inmates.
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jimthompson5910 (jim_thompson5910):
you want to know the year when there are 1.1 million inmates
so you want to know the value of x (the year) when N = 1.1 (N is number of inmates in millions)
so,
N=0.05x - 99.25
1.1 = 0.05x - 99.25 .. plug in N = 1.1
now solve for x
OpenStudy (anonymous):
how do I solve for x
jimthompson5910 (jim_thompson5910):
first you want to move that 99.25 over, how do you do that?
jimthompson5910 (jim_thompson5910):
how do you undo the subtraction of 99.25?
OpenStudy (anonymous):
99.25 + 0.05x?
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jimthompson5910 (jim_thompson5910):
what do you need to add to both sides
OpenStudy (anonymous):
oh ok so 1.1 + 99.25 = 0.05x - 99.25 + 99.25
jimthompson5910 (jim_thompson5910):
good
jimthompson5910 (jim_thompson5910):
notice how the - 99.25 + 99.25 on the right side adds up to 0, and it goes away
jimthompson5910 (jim_thompson5910):
so this is effectively like you're "moving" the 99.25 over to the other side
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OpenStudy (anonymous):
correct so now i have 1.1 + 99.25 = 0.05x
jimthompson5910 (jim_thompson5910):
now combine the terms on the left side
OpenStudy (anonymous):
which becomes 100.35 = 0.05x
jimthompson5910 (jim_thompson5910):
good
OpenStudy (anonymous):
then I would divide 100.35 by 0.05 right
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jimthompson5910 (jim_thompson5910):
correct, you want to undo the multiplication of 0.05
jimthompson5910 (jim_thompson5910):
so you divide both sides by 0.05
OpenStudy (anonymous):
which would give me the 2007
jimthompson5910 (jim_thompson5910):
yep
jimthompson5910 (jim_thompson5910):
x = 2007
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OpenStudy (anonymous):
ok thank you so much seems simple now
jimthompson5910 (jim_thompson5910):
you're welcome, yeah it's not too bad once you get a handle on it and practice it
OpenStudy (anonymous):
I have so many more problems that I dont understand
jimthompson5910 (jim_thompson5910):
well don't hesitate to ask, but keep in mind that you should try some yourself and see how far you get
jimthompson5910 (jim_thompson5910):
ideally there should be a balance between asking questions and doing the work on your own
ie, you shouldn't go crazy asking questions, but at the same time, you shouldn't be afraid to ask
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OpenStudy (anonymous):
I agree I think I have done good so far on my own
jimthompson5910 (jim_thompson5910):
that's good, you don't want to be completely reliant on others
OpenStudy (anonymous):
I have a total of 200 questions that I am doing and only have 26 left that I havent been able to figure out on my own
jimthompson5910 (jim_thompson5910):
wow that's a lot
OpenStudy (anonymous):
yeah I know
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jimthompson5910 (jim_thompson5910):
are the 26 you've yet to figure out related at all?
jimthompson5910 (jim_thompson5910):
or are some related
OpenStudy (anonymous):
only one is related to what we just did
OpenStudy (anonymous):
the rest are different
jimthompson5910 (jim_thompson5910):
ok try to do that one and see if you get anywhere with it
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