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zeesharpe05
22.07.2021 •
Mathematics
The frequency distribution for the weekly incomes of students with part time jobs is listed below. Construct the corresponding relative frequency distribution. Round relative frequencies to the nearest hundredth of a percent if necessary.
Income ($): Frequency:
200-300 60
301-400 73
401-500 91
501-600 89
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Ответ:
1. +(3X-4)=15
2. -(3X-4)=15
Now we need to solve. Let's solve "1" first
3X-4=15
First, we need to get 3X by itself. We do this by adding four to both sides.
3X-4+4=15+4
3X=19
Now we divide both sides by 3.
3X/3=19/3
X=19/3
Now we have one of our answers. However, all of the choices have 19/3 as part of the answer, so we cannot eliminate any choices.
Next we solve our second problem.
-(3X-4)=15
We must first get rid of the parentheses. Because the negative sign distributes, we must change the signs of 3X and -4.
-(3X-4)=15
-3X+4=15
Now we need to get -3X by itself. We do this by subtracting 4 from both sides.
-3X+4-4=15-4
-3X=11
Now we need to divide both sides by -3.
(-3X)/(-3)=11/(-3)
X=11/(-3)
The negative sign on the bottom affects the whole right side, so we can move the negative to the front.
X=11/(-3)
X=-11/3
Now that we have the second answer, we can say that the answer is "c."