Evaluate the expression 2x + 3; if x = 3

2 answers:

7 0

Answer: 9

Step-by-step explanation:

2x+3

2(3)+3

6+3

3 0

We know the value of x. We just have to substitute 3 in x in the equation.

2(3) + 3

6 + 3

9 is your answer. I hope this helps! Let me know if you need more help!

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morpeh [17]

The predictive value of a positive test is is 0.43.

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This question is solved using the concepts of sensitivity and specificity.

Sensitivity: It is the true negative rate, that is, the proportion of people without the disease that test negative.
Specificity: It is the true positive rate, that is, the proportion of people with the disease that test positive.

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Sensitivity of 60% means that of the 100 - 10 = 90% of people without the disease, 60% test negative and 100 - 60 = 40% test positive.
Specificity of 70% means that of the 10% with the disease, 70% test positive.

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The predictive value of a positive test is:

Probability of a positive test, which is 40% of 90% plus 70% of 10%, so:

$p = 0.4\times0.9 + 0.7\times0.1 = 0.43$