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Lana71 [14]
3 years ago
6

Please, I need this ASAP. Find the value of x.

Mathematics
1 answer:
ira [324]3 years ago
4 0

Answer:

x = 12\sqrt{2}

Step-by-step explanation:

Cos 45= 12/x

x=12/Cos 45

x=\frac{12}{\frac{\sqrt{2}}{2}}

x=\frac{24}{\sqrt{2}}

x= 12\sqrt{2}

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What it the answer to 5r-1/5=4/5
Naily [24]
First in order to solve you need to get rid of the fraction. You can do so by multiplying to entire equation by the denominator like so...

5(5r - 1/5) = (4/5)5
25r - 1 = 4
Then to isolate the variable you need to add 1 to both sides.
25r = 5
Then you divide.
r = 5/25
Simplify.
r = 1/5
I hope this helps love! :)
3 0
3 years ago
Read 2 more answers
SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Fin
Tomtit [17]

Answer:

Mean: 40.17 years.

Standard deviation: 10.97 years.

Step-by-step explanation:

The frequency distribution is in the attached image.

We can calculate the mean adding the multiplication of midpoints of each class and frequency, and dividing by the sample size.

The midpoints of a class is calculated as the average of the bounds of the class.

Then, the mean can be written as:

E(X)=\dfrac{1}{N}\sum f_iX_i\\\\\\E(X)=\dfrac{1}{60}(3\cdot15+7\cdot25+18\cdot35+20\cdot45+12\cdot 55)=\dfrac{45+175+630+900+660}{60}\\\\\\E(X)=\dfrac{2,410}{60}=40.17

The standard deviation can be calculated as:

s=\sqrt{\dfrac{1}{N-1}\sum f_i(X_i-E(X))^2}\\\\\\s=\sqrt{\dfrac{1}{59}[3(15-40.17)^2+7(25-40.17)^2+18(35-40.17)^2+20(45-40.17)^2+12(55-40.17)^2]}

\\\\\\s=\sqrt{\dfrac{1}{59}( 1,900.59  + 1,610.90  + 481.12  + 466.58  + 2,639.15  )}\\\\\\s=\sqrt{\dfrac{ 7,098.33 }{59}}=\sqrt{120}=10.97

4 0
3 years ago
Find the area of a square with side length 4/5 yard.
BigorU [14]

Answer:

side length = 0.8 yards

area = side length^2= 0.8^2 = 0.64 or 64/100

Step-by-step explanation:

hope that helped

6 0
3 years ago
Read 2 more answers
I will givee Brainlist if anyone answers all these questions
vaieri [72.5K]
Theirs no picture, I dong know if you forgot to put it along with it but theirs nothing to answer
5 0
3 years ago
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There are exactly 2.54 centimeters in 1 inch. When using this conversion factor, how many significant figures are you limited t
IgorC [24]

Significant figures tells us that about how may digits we can count on to be precise given the uncertainty in our calculations or data measurements.

Since, one inch  = 2.54 cm.

This is equivalent as saying that 1.0000000.. inch = 2.540000... cm.

Since the inch to cm conversion doesn't add any uncertainty, so we are free to keep any and all the significant figures.

Since, being an exact number, it has an unlimited number of significant figures and thus when we convert inch to cm we multiply two exact quantities together. Therefore, it will have infinite number of significant figures.

5 0
3 years ago
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