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3 years ago

What number will it turn out to be?

Mathematics

1 answer:

labwork [276]3 years ago

7 0

Answer:

-2

Step-by-step explanation:

let the number be 'x'

then the equation can be:

12 - 2x = 8(x+4)

12 - 2x = (8*x) + (8*4)

12 - 2x = 8x + 32

(bring variables to one side and constant terms to another side)

-2x - 8x = 32 - 12

so,

-10x = 20

therefore, x = 20/-10 = -2

so, the number is -2.

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Tatiana [17]

Answer:

175 (b)

Step-by-step explanation:

25*14=350

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3 years ago

Solve the system of equations using substitution 4x + 2y = 16 =−12+5

mario62 [17]

Answer:

$x=\frac{70}{11},\:y=\frac{20}{11}$

Step-by-step explanation:

$\begin{bmatrix}4x+2y=16y\\ y=-\frac{1}{2}x+5\end{bmatrix}$

$\mathrm{Substitute\:}y=-\frac{1}{2}x+5$

$\begin{bmatrix}4x+2\left(-\frac{1}{2}x+5\right)=16\left(-\frac{1}{2}x+5\right)\end{bmatrix}$

$Simplify$

$\begin{bmatrix}3x+10=16\left(-\frac{1}{2}x+5\right)\end{bmatrix}$

Isolate x for 3x+10=16(-1/2x+5): $x=\frac{70}{11}$

$\mathrm{For\:}y=-\frac{1}{2}x+5$

$\mathrm{Substitute\:}x=\frac{70}{11}$

$y=-\frac{1}{2}\cdot \frac{70}{11}+5$

$-\frac{1}{2}*\frac{70}{11}+5=\frac{20}{11}$

$y=\frac{20}{11}$

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:}$

$x=\frac{70}{11},\:y=\frac{20}{11}$

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3 years ago

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Answer & Step-by-step explanation:

The circumference is basically the perimeter of a circle. The circumference of a circle is found by multiplying the diameter by π (pi):

$C=\pi d$

or by multiplying the radius (which is half of the diameter) by 2 and π:

$C=2\pi r$

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4 years ago

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