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ser-zykov [4K]
3 years ago
10

maria bought g gallons of gas, spending a total of $41.49. Each gallon of gas costs 3.68. How many gallons of gas did maria buy?

​
Mathematics
2 answers:
dangina [55]3 years ago
6 0

Answer:

She bought 12 gallons.

41.49 / 3.68 = 11.2

*I rounded it to 12 because you can't go below 11.2*

12 x 3.68 = 41.49

Svetach [21]3 years ago
6 0

Answer:

11.2744565 gallons of gas.

Step-by-step explanation:

We divide 41.49 by 3.68 to get our answer.

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What is the answer - 2x² +5X-370​
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Answer:

predictive value of a positive test = 18.18%

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Step-by-step explanation:

Sensitivity = 60% = 0.6

Specificity = 70% = 0.7

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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

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

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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

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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
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