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allochka39001 [22]
2 years ago
9

A wallet contains $40 has three times as many $1 notes as $5 notes. find the number of each kind

Mathematics
1 answer:
Lunna [17]2 years ago
3 0
X=one dollar
y=5 dollar

x=3y
1x+5y=40
3y+5y=40
8y=40
divide 8
y=5
x=3y
x=3(5)
x=15

15 one dollars
5 five dollars
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Answer:

\dfrac{1}{3}.

Step-by-step explanation:

In quadrilateral QRST, Q(-1,0), R(5,0), S(3.5,-6), T(-2.5,-6).

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Distance formula:

D=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}

Using distance formula , we get

QR=\sqrt{(5-(-1))^2+(0-0)^2}=\sqrt{6^2}=6

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Now,  

\text{Scale factor}=\dfrac{Q'R'}{QR}

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2 years ago
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aalyn [17]

Answer:

Step-by-step explanation:

x= money earned per hour working as a cashier.

y=money earned per hour working delivering newspapers.

We propose the following system of equations:

5x + 4y =77

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We solve the system by reduction method:

-6*(5x+4y=77) ⇒  -30x-24y=-462

5*(6x+3y=78)⇒     30x+15y=390

                             ---------------------------

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Now, we get the value of "x" replacing the value of "y" by "8" in any part of the equation above.

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5x=45

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therefore;  

money earned per hour working as a cashier= $9/ hour

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HEY THERE !!

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