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3 years ago

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

2 answers:

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 r, which means you need to get r 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:

99% of confidence intervals for mean age of ICU patients

(53.8920 , 61.2079)

Step-by-step explanation:

Explanation:-

Given sample mean $x^{-} = 57.55$

Given standard error is determined by

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

Given data standard error = 1.42

99% of confidence intervals for mean is determined by

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

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

$(x^{-} - 2.576 S.E , x^{-} + 2.576 S.E)$

$(57.55 - 2.576X 1.42 , 57.55+ 2.576 X1.42)$

(53.8920 , 61.2079)

Conclusion:-

99% of confidence intervals for mean is determined by

(53.8920 , 61.2079)

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Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

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