Answer:
8
Step-by-step explanation:
J'espère que cela t'aides! si c'est le cas, puis-je avoir un brainliest ?
Answer:
9in
Step-by-step explanation:
54 = 1/2(12*x)
54 = 6*x
x = 9
Check
12 x 9 = 108
108/2 = 54
Answer:
the opposite Angles sum up to give 180
Step-by-step explanation:
3y +3y = 180
y=30
if y = 30 the x = 55
are you clear?
Answer:
Now x is equals to 11
-2(11) + 1 = - 22 + 1 = - 21
The answer is - 21
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Answer:
converts Celsius to Fahrenheit.
converts Fahrenheit to Celsius.
Step-by-step explanation:
Write given data in the table
![\begin{array}{cc}x&f(x)\\^{\circ}\text{C}&^{\circ}\text{F}\\20&68\\30&86\end{array}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Bcc%7Dx%26f%28x%29%5C%5C%5E%7B%5Ccirc%7D%5Ctext%7BC%7D%26%5E%7B%5Ccirc%7D%5Ctext%7BF%7D%5C%5C20%2668%5C%5C30%2686%5Cend%7Barray%7D)
Let the expression for the function be
![f(x)=ax+b](https://tex.z-dn.net/?f=f%28x%29%3Dax%2Bb)
Note, that this equation is linear equation and it is well-known fact that the Celsius to Fahrenheit dependence is linear.
Substitute corresponding values into this expression:
![68=20a+b\\ \\86=30a+b](https://tex.z-dn.net/?f=68%3D20a%2Bb%5C%5C%20%5C%5C86%3D30a%2Bb)
Subtract these two equations:
![86-68=30a-20a\\ \\10a=18\\ \\a=\dfrac{9}{5}](https://tex.z-dn.net/?f=86-68%3D30a-20a%5C%5C%20%5C%5C10a%3D18%5C%5C%20%5C%5Ca%3D%5Cdfrac%7B9%7D%7B5%7D)
Substitute it into the first equation:
![68=20\cdot \dfrac{9}{5}+b\Rightarrow b=68-36=32](https://tex.z-dn.net/?f=68%3D20%5Ccdot%20%5Cdfrac%7B9%7D%7B5%7D%2Bb%5CRightarrow%20b%3D68-36%3D32)
So,
![f(x)=\dfrac{9}{5}x+32](https://tex.z-dn.net/?f=f%28x%29%3D%5Cdfrac%7B9%7D%7B5%7Dx%2B32)
This is the function which converts Celsius to Fahrenheit.
And function
converts Fahrenheit to Celsius.