I think the answer is 38,068692.544
Answer:
The answer is 1247.33 square inches.
Step-by-step explanation:
So you have an regular octagon.
There are 8 congruent triangles with sides of 21 inches.
First, you need to find the inside angle. The angle of the circle is 360 degrees. There are 8 congruent triangles, so you devide 360/8 and that is 45 degrees.
Then you drop an altitude from the triangle. It will divide the triangle into 2 smaller triangles with angle of 22.5 degrees.
Now you just use trigonemtric functions.
Sin(22.5 deg) = x/21
x= 21*sin(22.5 deg)
x= 8.0363 in
Cos (22.5 deg) = y/21
y= 21*(cos 22.5 deg)
y= 19.401 in
Now you use a formula for calculating the area of triangle.
(8.0363*19.401)/2=77.958 sq inches.
You just calculated area of one triangle. Octagon have 8 triangles and every one of those 8 triangles, we divided into 2 right triangles. That means, that in total, we have 16 triangles.
That is why we multiply 77.958*16
The answer is 1247.33 square inches.
I hope I helped you and I will be happy If you mark my answer as brainliest.
Answer:
Step-by-step explanation:
Let's go:
I've just answered the second one.
1)
Expressions that greater than 3:
1.67 + 1.4
3.017 - 0.005
4.5 - 1.47
3)
That's true.
I hope I've helped you.
The accuracy in the research done by university is 0.81, sensitivity is 0.93, specificity is 0.81 and precision is 0.047.
Given sample size of 58205 and proportion of people donated 576. Cutoff is 0.5.
Probability is the chance of happening an event among all the events possible. It lies between 0 and 1.
TP=total people donated in sample, TN=total number of people,FP=donation,FN=No donation
Accuracy is calculated as under:
=(TP+TN)/(TP+TN+FP+FN)
=(268+23439)/(238+23439+5375+20)
=23707/29102
=0.81
Accuracy=0.81
Sensitivity is calculated as under:
=TP/(TP+FN)
=268/(268+20)
=268/288
=0.93
Precision is calculated as under:
=TP/(TP+FP)
=268/(268+5375)
=268/5643
=0.047
Their values are the probabilities in itself.
Hence accuracy is 0.81, sensitivity is 0.93, specificity is 0.81 and precision is 0.047.
Learn more about probability at brainly.com/question/24756209
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Answer:
1.3-4= -3.7
if you mean decreased by 4 whole