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Nesterboy [21]
3 years ago
11

Sarah cut off 1/8 of a 48 inch piece of ribbon. Jane cut off 1/9 of a 36 inch piece of ribbon. they compare their cut pieces. wh

o's piece is longer? how much longer is it?
Mathematics
1 answer:
andrey2020 [161]3 years ago
3 0
All we need to do is to find out how much is 1/8 of 48 and 1/9 of 36:

1/8 * 48 =
= 48/8 =
= 6

1/9 * 36 =
= 36/9 =
= 4

It means that Sarah had 6 inches piece, while Jane had 4 inches piece.

Answer: Sarah had a piece of ribbon which was longer than Jane's one by 6 - 4 = 2 feet.
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A screening test for a newly discovered disease is being evaluated for its performance as a screening test. In order to determin
Elena-2011 [213]

Answer:

- Sensitivity = 62.7 %

- specificity = 74.9 %

- positive predictive value = 45.2 %

- negative predictive value = 85.9 %

- Accuracy of the test = 71.9 %

Step-by-step explanation:

Given the data in th question;

                                 CONDITION POSITIVE    CONDITION NEGATIVE   TOTAL

TEST POSITIVE                   42                                       51                            93

TEST NEGATIVE                 25                                      152                          177

TOTAL                                  67                                     203                         270

so; A=42, B=51, C=25 and D=152

Sensitivity = [A / ( A + C) ]×100= [42 /( 42 + 25)]×100 = [42 / 67] 100=

Sensitivity = 62.7 %

specificity = [D / ( D + B) ]×100= [152 /( 152 + 51)]×100 = [152 / 203] 100=

specificity = 74.9 %

positive predictive value = [A / ( A + B) ]×100 = [42 /( 42 + 51)]×100 =[42/93] 100

positive predictive value = 45.2 %

negative predictive value =  [D / ( D + C) ]×100 = [152 /( 152 + 25)]×100 =[152/177] 100

negative predictive value = 85.9 %

Accuracy of the test = [A + D / ( A+B+C+D)] =  [42 + 152 / ( 42+51+25+152)]

= [ 194 / 270 ]

Accuracy of the test = 71.9 %

3 0
2 years ago
Please simplify will give brainliyest
dimulka [17.4K]

   

\displaystyle\bf\\-\sqrt{m^4n^7}=\\\\=-\sqrt{m^{2\times2}\times n^{3\times2+1}}=\\\\=-\sqrt{m^{2\times2}\times n^{3\times2}\times n}}=\\\\=-\sqrt{\Big(m^2\Big)^2\times \Big(n^3\Big)^2\times n}}=\\\\=-\sqrt{\Big(m^2\times n^3\Big)^2\times n}}=\\\\=\boxed{\bf-m^2n^3\sqrt{n}}

 

4 0
3 years ago
PLEASE HELP!! Anyone??
klasskru [66]
Replace P with 15:

d = -3(15)^2 + 168(15) - 315

d = -3(225) + 2520 - 315

d = -675 + 2520 -315

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3 0
3 years ago
Find the value of <br> x<br> x<br> that makes the expressions equivalent.<br> 2(x+9); 30+18
Vlada [557]

Answer:

x=15

Step-by-step explanation:

We are given the equations 2(x+9), 30+18 to search for a value of x that yields an equivalent statement.  2(x+9)=30+18\\2(x+9)=48\\x+9=24\\x=15.

7 0
3 years ago
Read 2 more answers
What is the surface area of the triangular prism
Harrizon [31]

Answer:

surface \: a = 9 \times 5 \\  =  45ft \times 2 \\  =   {90}^{2} ft\\ surface \: b =  \frac{1}{2} bh \\  =  \frac{1}{2 }  \times 6 \times 4 \\  = 3 \times 4 \\  = 12 \times 2 \\  =  {144}^{2} ft \\  =  90 + 144 \\  =  {234}^{2} ft

3 0
3 years ago
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