Please help me on this

Mathematics

2 answers:

Lelu [443]3 years ago

8 0

I need the points my bad

stich3 [128]3 years ago

4 0

Both are A)

I used the calculator both
On 12 I just plugged in the answers and I figured out which one equaled to each other.

I also used the calculator on 13
I plugged in the x to the equation given.

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It x, y, and z are positive intergers and 3x = 4y = 7z, then the least possible value of x + y + z is???

Dmitry [639]

$3x = 4y = 7z \\ \Rightarrow \begin{cases}3x - 4y = 0 \\4y - 7z = 0 \\ 7z - 3x = 0\end{cases} \\ \Leftrightarrow \begin{cases}x = \frac{4}{3} y\\4y - 7z = 0 \\ 7z - 3( \frac{4}{3}y) = 0\end{cases} \\ \Leftrightarrow \begin{cases}x = \frac{4}{3} y\\4y - 7z = 0 \\ 7z - 4y= 0\end{cases} \\ \Leftrightarrow \begin{cases}x = \frac{4}{3} y\\ y \\ z = \frac{4}{7}y \end{cases} \\ x,y,z\: are\: intergers\Rightarrow y=LCM(3,7)=21\Rightarrow x = 28,z = 12 \\ \Rightarrow x + y + z = 61$

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3 years ago

12.15x19 Need this asap thanks yall have a blessed day :)

valentinak56 [21]

Answer:

The answer would be 230.85

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3 years ago

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What is the result when the number 80 is decreased by 32%?

Goryan [66]

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54.4

Step-by-step explanation:

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(40x9)÷(4x8)=x solve for variable of x

nikklg [1K]

The answer is: " x = 11 ¼ " ; or write as: " x = 11.25 " .
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Explanation:
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(40*9) ÷ (4*8) = x ; Solve for "x" ;

(40 * 9 = 360) .

(4 * 8 = 32) .

(360) ÷ (32) = 45/4 = 11 ¼ ; or write as: 11.25 .
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Step-by-step explanation:

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3 years ago

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