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Andrei [34K]
2 years ago
13

(-1) + (-6) + ____ = -1

Mathematics
2 answers:
kenny6666 [7]2 years ago
7 0
The answer is 6
because the (-1)+(-6)+ 6=-1
Nastasia [14]2 years ago
3 0
(-1)+(-6)= -7

-7 + 6 = -1

therefore, the answer is 6.
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Evaluate <br> |-9|= <br><br> Please helpp
miv72 [106K]

Answer:

9

Step-by-step explanation:

How to solve your question

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6 0
3 years ago
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Amy and her sister are making lemonade for the school dance. Their recipe makes 2 quarts of lemonade. If they make 35 times the
Anastaziya [24]
Its 17.5 gallons because 2 quarts times 35 equals 70 quarts and 17.5 gallons equals 70 quarts
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3 years ago
A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new
Anit [1.1K]

Answer:

predictive value of a positive test = 18.18%

predictive value of a negative test = 94.03%

Step-by-step explanation:

Sensitivity = 60% = 0.6

Specificity = 70% = 0.7

Let True Positive = TP

True Negative = TN

False Negative = FN

Sensitivity = \frac{TP}{TP + FN} \\0.6 = \frac{TP}{TP + FN} \\0.6TP + 0.6FN = TP\\0.4TP = 0.6FN\\TP = 1.5 FN

Specificity = \frac{TN}{TN + FP} \\0.7 = \frac{TN}{TN + FP} \\0.7TN + 0.7FP = TN\\0.7FP = 0.3 TN\\TN  = 7/3 FP

Prevalence = 10% = 0.1

Three hundred people are screened, T_{total} = 300

Total number of people having the disease, T_{disease} = ?

Prevalence = \frac{T_{disease} }{T_{total} } \\0.1 =  \frac{T_{disease} }{300 }\\T_{disease} = 30

T_{disease} = TP + FN\\30 = TP + FN

But TP = 1.5 FN

30 = 1.5 FN + FN

30 = 2.5 FN

FN = 30/2.5

FN = 12

TP = 1.5 FN = 1.5 * 12

TP = 18

FP + TN = T_{total} - T_{disease} \\FP + TN = 300 - 30\\FP + TN = 270\\FP + \frac{7}{3} FP = 270\\\frac{10}{3} FP = 270\\FP = 27 * 3\\FP = 81

81 + TN = 270

TN = 189

To calculate the Predictive value of positive test (PPT)

PPT = \frac{TP}{TP + FP} * 100\\PPT = \frac{18}{18+81} * 100\\PPT = \frac{18}{99} * 100\\PPT = 18.18 \%

To calculate the Predictive value of negative test (PNT)

PPT = \frac{TN}{FN + TN} * 100\\PPT = \frac{189}{189+12} * 100\\PPT = \frac{189}{201} * 100\\PPT = 94.03 \%

7 0
3 years ago
Rewrite 7x^5/2 in simplest radical form
Diano4ka-milaya [45]

Answer:

7x²sqrt(x)

Step-by-step explanation:

7x^(5/2)

7x^(2½)

7x^(2+½)

7x² × x^½

7x²sqrt(x)

sqrt: square root

4 0
3 years ago
A donut has a circumference of 18.84 cm. what is the donut's radius?
pantera1 [17]
The radius of the donut is 3.14
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3 years ago
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