Ask question

Ask question

All categories

2 years ago

8

A circular sector has a central angle of π9 radians and a radius of 13 cm. What is the area of the sector? Use 3.14 for pi. Roun

d your answer to the nearest tenth. Enter your answer in the box. area = cm2

1 answer:

Nastasia [14]2 years ago

7 0

Answer:

29.5

Step-by-step explanation:

I took the test and this is what he correct answer is!!

Hope it helps!!

You might be interested in

The following graphs show the performance of two stocks over the first five months of the year. A graph titled Stock A B C has m

hichkok12 [17]

Answer:

C) Stock XYZ shows the best performance. The scale of Stock XYZ makes the graph appear to be rising more slowly.

Step-by-step explanation:

i did this question on my test, from reading the graph, i am almost certain this is the answer. correct me if i am wrong!

8 0

2 years ago

Read 2 more answers

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

Simplify the expression b+2/b^2-4

Lubov Fominskaja [6]

3b because b^2-4= 1/b. So 2/1/b= 2b b+2b = 3b

8 0

2 years ago

Read 2 more answers

Can someone explain this i got 2 but I am really confused help me pls

Assoli18 [71]

Answer:

its either b or d im not sure sorry

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

PLEASE HELP! I'M STUCK ON THIS QUESTION

swat32

I think its B even though they are not in the same order and form they are still the same just in different ranges

5 0

3 years ago