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3 years ago

Find the value of n -2(4 + 2n)= -20

Mathematics

1 answer:

Mamont248 [21]3 years ago

8 0

Answer:

n= -3

-2(4+2n) = - 20

-8+4n = -20

4n = -20+8

4n = -12

divide both sides by 4

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Wewaii [24]

Answer:

Radius: 8

Circumference: 50.27

πr^2 = Area of circle

201.06 = πr^2

divide by pi

201.06 / π = 63.9993857161 = 64

64 = r^2

Square root both sides to get radius.

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Circumference = π x diameter

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Circumference = π x 16 = 50.2654824574 = 50.27

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3 years ago

Quando laerte nasceu o pai dele tinha 28 anos atualmente laerte tem 18 anos determine a soma das idades de laerte e de seu pai

Alchen [17]

28 + 18 - pai, <span>atualmente
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3 years ago

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horrorfan [7]

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3 years ago

The ratio of swordfish to marlins caught on a deep sea fishing trip was 20 to 15. If 27 marlins were caught, how many swordfish

Kisachek [45]

20/15=N/27
Do cross multiplication.
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3 years ago

The sum of four times a number and five times another number is -28. The sum of nine times the first number and two times the se

Rina8888 [55]

Answer:

Step-by-step explanation:

$x,\ y-the\ numbers\\\\\text{The sum of four times a number and five times another number is -28:}\\\\4x+5y=-28\\\\\text{The sum of nine times the first number and two times the second number is 11:}\\\\9x+2y=11\\\\\text{We have the system of equations:}\\\\\left\{\begin{array}{ccc}4x+5y=-28&\text{multiply both sides by2}\\9x+2y=11&\text{multiply both sides by (-5)}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}8x+10y=-56\\-45x-10y=-55\end{array}\right}\qquad\text{add both sides of the equation}$

$.\qquad-37x=-111\qquad\text{divide both sides by (-37)}\\.\qquad\qquad\boxed{x=3}\\\\\text{Put the value of x to the first equation:}\\\\4(3)+5y=-28\\12+5y=-28\qquad\text{subtrac 12 from both sides}\\5y=-40\qquad\text{divide both sides by 5}\\\boxed{y=-8}$

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3 years ago