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Rasek [7]
3 years ago
13

The measure of an angle is 8 times the measure of its complement. tina writes an equation and finds the correct measure of each

angle. which shows the equation tina could have written and the angle measures she could have found?
Mathematics
1 answer:
pogonyaev3 years ago
5 0
One of the unknown angles (let's called it n) has a complement (meaning their sum adds up to 90 degrees) and the other angle is 8 times the unknown angle (8n)

With all this information, you should have the equation:

n + 8n = 90

To solve, combine like terms to get:

9n = 90

Divide by 9 on both sides to isolate the variable n.

n = 10

Now we plug back in to find our angle measurements. The first angle, n, is 10 degrees. The second angle, 8n, is 8 * 10 which is 80; the second angle is 80 degrees. 
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Sphinxa [80]
<span>Elevation of city D is half the elevation of city C, It is given that the evelation of city C is 12 feet above the sea level level. Hence elevation of city D=12/2=6feet above the sea level. This is the answer to part A The elevation of city D=x/2, where x is the elevation of city C in feet. For part B write, here x=12 hence x/2=6 Therefore the elevation of city D is 6feet above the sea level.
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4 0
3 years ago
Read 2 more answers
The accompanying data on x = current density (mA/cm2) and y = rate of deposition (µm/min) appeared in an article. Do you agree w
Sever21 [200]

Answer:

r=\frac{4(321)-(200)(5.17)}{\sqrt{[4(12000) -(200)^2][4(8.6861) -(5.17)^2]}}=0.98726  

So then the correlation coefficient would be r =0.98726

And the determination coeffcient would be:

r^2 = 0.98726^2 = 0.975

And that means that the a linear model will explain about 97.5% of the variability in the data. So for this case we can conclude that we have a strong linear relationship.

Step-by-step explanation:

Data given

col1 x 20 40 60 80

col2 y 0.24 1.10 1.71 2.12

Solution to the problem

We can find the correlation coefficient we can use this formula:  

r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}  

For our case we have this:

n=4 \sum x = 200, \sum y = 5.17, \sum xy = 321, \sum x^2 =12000, \sum y^2 =8.6861  

r=\frac{4(321)-(200)(5.17)}{\sqrt{[4(12000) -(200)^2][4(8.6861) -(5.17)^2]}}=0.98726  

So then the correlation coefficient would be r =0.98726

And the determination coeffcient would be:

r^2 = 0.98726^2 = 0.975

And that means that the a linear model will explain about 97.5% of the variability in the data. So for this case we can conclude that we have a strong linear relationship.

3 0
3 years ago
From a launch pad, a rocket is launched at an angle of 60? relative to sea level.
bekas [8.4K]
This is the concept of trigonometry:
The vertical height will be given by the formula:
sin θ= opposite/hypotenuse
where:
θ=60°
opposite=vertical height=a0
hypotenuse=slanting side=300 ft
thus plugging the values we get:
sin 60=a0/300
hence
a0=300 sin 60
thus evaluating this we get
a0=259.81 ft

Thus the vertical height is 259.81 ft~260 ft


7 0
3 years ago
Read 2 more answers
5x - 7 = 4x - 1 <br>solution or no solution​
lana [24]

Answer:

5x-4x=-1+7

X=6

Step-by-step explanation:

8 0
3 years ago
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JulsSmile [24]

Answer:

13

Step-by-step explanation:

9+4=13

when dividing, exponents subtract

8 0
3 years ago
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