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ELEN [110]
3 years ago
14

What is the value of r in the equation 4r − 8 = 5r + 12?

Mathematics
2 answers:
USPshnik [31]3 years ago
6 0

To find r, we have to isolate it on one side of the equation. We can do this by "undoing" the equation one step at a time.

4r - 8 = 5r + 12

4r - 8 - 4r = 5r + 12 - 4r

-8 = r + 12

-8 - 12 = r + 12 - 12

-20 = r

r = -20

Hope this helps!

Kipish [7]3 years ago
5 0

Answer:

r= -20

Step-by-step explanation:

you need to solve this equation for the variable <em>r</em>, which means you need to get <em>r </em>alone on one side of the equation.

4r-8=5r+12

subtract 4r from both sides

-8=5r-4r+12

-8=1r+12

subtract 12 from both sides

-8-12=r

simplify

-20=r

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Answer:

<em>99% of confidence intervals for mean age of ICU patients</em>

<em>(53.8920 , 61.2079)</em>

Step-by-step explanation:

<u><em>Explanation</em></u>:-

<em>Given sample mean </em>x^{-} = 57.55<em></em>

Given standard error is determined by

                                                             S.E =\frac{S.D}{\sqrt{n} }

<em>Given data standard error = 1.42</em>

<em>99% of confidence intervals for mean is determined by</em>

(x^{-} - Z_{0.01} \frac{S.D}{\sqrt{n} } , x^{-} + Z_{0.01} \frac{S.D}{\sqrt{n} } )

Z_{\frac{\alpha }{2} } = Z_{\frac{0.01}{2} } = Z_{0.05} = 2.576

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(53.8920 , 61.2079)

<u><em>Conclusion</em></u>:-

<em>99% of confidence intervals for mean is determined by</em>

<em>(53.8920 , 61.2079)</em>

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Below is the solution: 

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