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Marat540 [252]
3 years ago
10

Centerville has a population of 13000. People under the age of 18 make up 22% of the towns population. How many people under the

age of 18 live in Centerville?
Mathematics
1 answer:
Katen [24]3 years ago
8 0
To solve this proportion, we must use the percent proportion equation, 

a/b=p/100

If we put in our known variables, we get the equation

a/13000=22/100

Net, we use cross products to simplify this equation, or multiplying the numerator of one fraction by the denominator of another fraction and setting them equal to one another.

100a=286000

Finally, we divide both sides by the coefficient of the variable, to get it alone:

a = 2860

Therefore, 2860 people out of the total 13000 people that live in Centerville are under the age of 18.
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Which ordered pair is a solution of the equation
alekssr [168]

Answer:

OPTION D: NEITHER

Step-by-step explanation:

The given equation is: 7x - 2y = - 5

To find a solution to this, we substitute the options and compare LHS and RHS.

OPTION A: (1, 5)

LHS = 7(1) - 2(5) = 7 - 10 = -3

RHS = - 5

LHS $ \ne $ RHS.

So, this option is eliminated.

OPTION B: (-1, 1)

LHS = 7(-1) - 2(1) = -7 - 2 = - 9

RHS = - 5

Again, LHS $ \ne $ RHS.

So, this Option is eliminated as well.

OPTION C: It says both A and B. Clearly, this is eliminated as well.

Therefore, the answer is: OPTION D: NEITHER.

NOTE: This is a two variable equation. So, we need a minimum of two equations to determine the solution. Since, only one equation is given here, we use the help of options.

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3 years ago
Solve 3x^2 6x=12 by quadratic formula
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Nostrana [21]

Answer:

Step-by-step explanation:

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3 years ago
What is the value of x in the equation 4x+8y=40 when y = 0.8
fgiga [73]

When y=0.8

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-> 4x +6.4 =40

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8 0
3 years ago
What value should be added to the expression to create a perfect square? x^2 - 20x
boyakko [2]
To complete the square:
we take the coefficient ox "x" (which in this problem is -20)
we divide it by 2
square that number
then add it to both sides of the equation

-20 / 2 = -10
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then we add 100 to both sides of the equation:
x^2 -20x
x^2 -20x +100 = 100
******************************************************
To get the roots of the equation, we take the square root of both sides:
(x -10) * (x-10) = 10
(x-10) = square root (10)
x-10 = <span> <span> <span> 3.1622776602 </span> </span> </span>
x1 = <span> <span> <span> 13.1622776602 </span>
and don't forget that square root of 10 also equals  </span></span><span><span><span> -3.1622776602 </span> </span> </span>
x2 = 10 -<span> <span> <span> 3.1622776602
x2 = </span></span></span> <span> <span> <span> 6.8377223398 </span> </span> </span>


4 0
3 years ago
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