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Oksana_A [137]
3 years ago
11

Select the correct answer

Mathematics
1 answer:
vaieri [72.5K]3 years ago
6 0

Answer:

B. \frac{4}{(d - 6)}

Step-by-step explanation:

\frac{2d - 6}{d^2 + 2d - 48} \div \frac{d - 3}{2d + 16}

Change the operation from ÷ to ×, then flip the fraction by your right upside down.

\frac{2d - 6}{d^2 + 2d - 48} \times \frac{2d + 16}{d - 3}

\frac{2d - 6}{d^2 + 8d - 6d - 48} \times \frac{2d + 16}{d - 3}

\frac{2(d - 3)}{d(d + 8) - 6(d + 8)} \times \frac{2(d + 8)}{d - 3}

\frac{2(d - 3)}{(d + 8)(d - 6)} \times \frac{2(d + 8)}{d - 3}

\frac{2(1)}{(1)(d - 6)} \times \frac{2(1)}{1}

\frac{2}{(d - 6)} \times \frac{2}{1}

\frac{2 \times 2}{(d - 6) \times 1}

\frac{4}{(d - 6)}

You might be interested in
Computer keyboard failures are due to faulty electrical connects (12%) or mechanical defects (88%). Mechanical defects are relat
anzhelika [568]

Answer:

(c) Probability that a failure is due to loose keys = 0.2376

(d) Probability that a failure is due to improperly connected or poorly welded wires = 0.078

Step-by-step explanation:

The Whole probability scenario is given for Computer Keyboard failures.

(a) Let F be the event of failure due to faulty electrical connects, P(F) = 0.12

 M be the event of failure due to mechanical defects, P(M) = 0.88

 LK be the event of mechanical defect due to loose keys, P(LK/M) = 0.27

 IA be the event of mechanical defect due to improper assembly, P(IA/M)   =0.73

 DW be the event of electrical connects due to defective wires,P(DW/F) = 0.35

 IC be the event of electrical connects due to improper connections,

  P(IC/F) = 0.13 .

PWW be the event of electrical connects due to poorly welded wires,

  P(PWW/F) = 0.52

(b)                                     <u> </u><u>Keyboard failures</u>

<h2>                              /               \</h2>

           <u> </u><u> Faulty electrical connects   </u>            <u>Mechanical Defects </u>          

                      P(F) = 0.12                                             P(M) = 0.88

<h2>        /            |             \                  /            \</h2>

<u><em>Defective wires</em></u>  <u><em>Improper</em></u>        <u><em>Poorly</em></u>                  <u><em>Loose Keys</em></u>      <u><em>Improper</em></u><em> </em>

P(DW/F)=0.35   <u><em>Connections</em></u>   <u><em>Welded wires</em></u>      P(LK/M)=0.27   <em> </em><u><em>Assembly</em></u>

                           P(IC/F)=0.13     P(PWW/F)=0.52                            P(IA/M)=0.73              

This is the required tree diagram.

(c) Probability that a failure is due to loose keys is given by:

  P(LK) =P(LK/M) * P(M) {This means mechanical failure is due to loose  

                                               keys}

    P(LK) = 0.27 * 0.88 = 0.2376 .

(d) Probability that a failure is due to improperly connected or poorly welded

     wires is given by P(IC \bigcup PWW) ;

 P(IC \bigcup PWW) = P(IC) + P(PWW) - P(IC \bigcap PWW) { Here P(IC \bigcap PWW) = 0 }

 P(IC) = P(IC/F) * P(F)  = 0.13 * 0.12 = 0.0156

 P(PWW) = P(PWW/F) * P(F) = 0.52 * 0.13 = 0.0676

Therefore, P(IC \bigcup PWW) = 0.0156 + 0.0676 - 0 = 0.078 .

8 0
4 years ago
WILL GIVE BRAINLIEST! SUPER CONFUSED!!!
kondor19780726 [428]

Answer:

For 1948 Men's :Interquartile range is 1.5, Median is 58.3

For 2012 Men's: Interquartile range is 0.315, Median is 47.86

You can infer that in 2012 the swimmers were better and it was more competitive as the interquartile range was lower and the median was also lower as well

Step-by-step explanation:

1948 Men's 100m

57.3, 57.8, 58.1, 58.3, 58.3, 59.3, 59.6,1:00.5

               ⬆                ⬆                 ⬆

         Low IQR      Median       High IQR

Low IQR is average of 57.8 and 58.1 = 57.95

High IQR  is average of 59.3 and 59.6 =  59.45

Median is average of 58.3 and 58.3 = 58.3

Interquartile range is High IQR- Low IQR

59.45 - 57.95=1.5

2012 Men's 100m

47.52, 47.53, 47.8, 47.84, 47.88, 47.92, 48.04, 48.44

                    ⬆                  ⬆                      ⬆

             Low IQR         Median          High IQR

Low IQR is average of 47.53 and 47.8 = 47.665

High IQR is average of 48.04 and 47.92 = 47.98

Median is average of 47.88 and 47.84 = 47.86

Interquartile range is High IQR-Low IQR

47.98-47.665=0.315

5 0
4 years ago
5. Why did it take 2 years for the U.S. to enter WW2 and why did we finally enter the war?
AlladinOne [14]
The U.S wanted to be isolationists

it did not enter the war untill the japanese bombed Pearl Harbor
6 0
3 years ago
Ben is making 12 fruit drinks. each drink uses 2/3 of a bottle f orange juice and 1/4 of a bottle of pineapple juice. What is th
valkas [14]
1 drink 2/3 oj
12 drinks x
X= 2/3 • 12
X=24/3
X= 8 orange juice bottles

1 drink 1/4 pj
12 drinks X
X=12•1/4
X=12/4
X= 3 pineapple bottles
5 0
3 years ago
Tiffany ran 6/7 mile on Saturday and only 1/2 as far on Sunday. How far did she run on Sunday? Select all correct responses belo
4vir4ik [10]

Answer:

3/7

Step-by-step explanation:

6/7 ÷ 2 = 6/14 as simplified as 3/7 in fraction form.

Hope I helped!! :)

Sorry if it's wrong! :(

Pls mark brainlist!!!

8 0
3 years ago
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