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alexira [117]
3 years ago
9

X/7=3/5 so x=??????????????????

Mathematics
2 answers:
g100num [7]3 years ago
6 0
X = 3 --->  3*7 = 21 so 5x = 21   
7    5

5x = 21   this equals 4.2
5       5     

frosja888 [35]3 years ago
5 0
By using cross multiplication x= 3×7÷5=4.2
the answer is 4.2
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Consider the function f (x) = StartFraction x squared + 11 x minus 12 Over x minus 1 EndFraction.
zhenek [66]

Answer:

"a removable discontinuity that can be removed by extending the function to include f(1) = 13"

Step-by-step explanation:

We have the function:

f(x) = \frac{x^2 + 11*x  - 12}{x - 1}

Here we have a problem when x = 1, because that makes the denominator to be equal to zero.

For now, let's see what happens to the numerator when x = 1

1^2 + 11*1 - 12 = 12 - 12 = 0

So x = 1 is a root of the numerator.

Let's find the other root of the numerator, here we can use Bhaskara's formula:

x = \frac{-11 \pm \sqrt{11^2 - 4*1*(-12)} }{2*1}  = \frac{-11 \pm 13}{2}

Then the two roots are:

x = (-11 + 13)/2 = 1

x = (-11 - 13)/2 = -12

And remember that a quadratic equation:

y = a*x^2 + b*x + c

With roots p and k, can be written as:

y = a*(x - p)*(x - k)

Then we can rewrite our numerator as:

1*(x - 1)*(x - (-12)) = (x - 1)*(x + 12)

Replacing that in the equation for f(x), we get:

f(x) = \frac{x^2 + 11*x  - 12}{x - 1} = \frac{(x - 1)*(x + 12)}{(x - 1)}  = \frac{x - 1}{x -1} *(x + 12)

f(x) = x + 12

And, when evaluated in x = 1, we get:

f(1) = 1 + 12 = 13

Then the correct option is:

"a removable discontinuity that can be removed by extending the function to include f(1) = 13"

4 0
2 years ago
Read 2 more answers
A=m-n for variable n<br> can someone please solve this for me
arsen [322]
It’s v idk but y - n + m =a
7 0
3 years ago
On a map drawn to scale, 2cm represents 870km. How long would a line segment be that represents 130 kilometres?
Archy [21]
870/2 = 435
130/435 = 26/87 = 0.5977 cm
8 0
3 years ago
How do you solve this kind of problem?
Y_Kistochka [10]
I hope this helps you

3 0
2 years ago
Read 2 more answers
5x+2y=22. -2x+6y=3 What is the X coordinate of the solution. Round to the nearest tenth
just olya [345]
Multiply first example by 3 and subtract by second example, you will get the following:

3*(5x + 2y) = 3*22   =>  3*5x + 3*2y = 66      =>  15x + 6y = 66
now subtraction:
(15x + 6y) - (-2x + 6y) = 66 - 3
15x + 6y + 2x - 6y = 63
15x + 2x + 6y - 6y = 63
17x = 63
x = 63/17 ≈ 3.705..... and as it says to round to the nearest tenth our answer would be: x = 3.7
8 0
3 years ago
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