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lutik1710 [3]
3 years ago
13

Mary has postcards and stamps. The ratio of the number of postcards to the number of stamps she has is 2:9. If Mary has 36 stamp

s, how many postcards does Mary have?
Mathematics
1 answer:
Liula [17]3 years ago
8 0

Answer:

8

Step-by-step explanation:

2:9

9*4 = 36

2*4 = 8

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How many pairs of parallel line segments are shown? <br><br> 1. 8<br> 2. 24<br> 3. 4<br> 4. 18
Burka [1]
For this case what you should see is each of the edges of the prism that are parallel.
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3 years ago
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What is the answer to this?
zepelin [54]

To find the y-intercept substitute x as 0

y = 1 \times  {0}^{2}  + 7 \times 0 - 5

y = 1 \times 0 + 0 - 5

y = 0 + 0 - 5

y =  - 5

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4 0
2 years ago
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18 cajas de manzanas y peras fueron llevadas a la escuela. Las peras trajeron 210 kg en 6 cajas. ¿Cuántos kilos de manzanas fuer
Katyanochek1 [597]

Answer:

504 kilos de manzanas fueron llevados a la escuela.

Step-by-step explanation:

Sean x, y la cantidad de cajas de manzanas y peras, respectivamente. De acuerdo con el enunciado, tenemos el siguiente sistema de ecuaciones:

Total de cajas

x+y = 18 (1)

Masa de cada caja de peras

y\cdot m_{P} = 210 (2)

y = 6 (3)

Masa de caja de manzanas

m_{M} = m_{P}+7 (4)

De (2) en (3), tenemos que la masa de cada caja de peras es:

m_{P} = 35\,kg

Por (4), encontramos que la masa de cada caja de manzanas es:

m_{M} = 35\,kg+7\,kg

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Finalmente, de (1) tenemos la cantidad de cajas de manzana:

x = 18-y

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La cantidad de kilos de manzanas llevada a la escuela se obtiene al multiplicar la cantidad de cajas de manzana por la masa de cada caja:

M = (12)\cdot (42\,kg)

M = 504\,kg

504 kilos de manzanas fueron llevados a la escuela.

7 0
3 years ago
Find the slope of the line that passes through the pair of points listed below.<br> (-2, -3), (6,5)
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\frac{y_{2}-y_{1}}{x_{2}-x_{1}}

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Hope this helped!

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5 0
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Elenna [48]
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