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suter [353]
3 years ago
8

A shop sells packs of black pens, packs of red pens and packs of green pens.

Mathematics
1 answer:
olchik [2.2K]3 years ago
4 0

Answer:

85 pens  

Step-by-step explanation:

The computation of the number of green pens sold is shown below;

As the number of black pens, red pens, and green pans is 3:5:6

And, the ratio of sold of black pens, red pens, and green pans is 7:3:4

So, the ratio of pens in a number of pens is

= 3 × 7 : 5 × 3 : 4 × 6

= 21: 15 : 24

= 7: 5 : 8

And, the total of 212 pens are sold

So, the number of green pens sold is

= 8 × 212 ÷ (7 + 5 + 8)

= 85 pens  

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How many ways are there to select 12 countries in the United Nations to serve on a council if 3 are selected from a block of 45,
sattari [20]

Answer: There are 2346953264 ways to do so.

Step-by-step explanation:

Since we have given that

Total number of selected countries = 12

Number of selected countries from a block of 45 = 3

Number of selected countries from a block of 57 = 4

So, remaining number of selected countries from a block of 69.

So, 12-(3+4)=12-7=5

Now, we need to find the number of ways, so we will use "Combination" to select that number of countries.

So, it becomes.

^{45}C_3\times ^{57}C_4\times ^{57}C_5\\\\=14190\times 395010\times 4187106\\\\=2346953264

Hence, there are 2346953264 ways to do so.

8 0
3 years ago
9y + 6 + 2(5 + y) = blank y + blank
maria [59]

Answer:

<h2><em>1</em><em>1</em><em>y</em><em>+</em><em>1</em><em>6</em></h2>

<em>Solution</em><em>,</em>

<em>9y + 6 + 2(5 + y) \\  = 9y + 6 + 10 + 2y \\  combine \: like \: terms \\  = 9y + 2y + 6 + 10 \\ simplify \\  = 11y + 16</em>

<em>hope </em><em>this </em><em>helps.</em><em>.</em><em>.</em>

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5 0
2 years ago
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Could I have assistance, please...?<br><br> Find the domain of the square-root function.
andrezito [222]

Answer:

x≥-8

Step-by-step explanation:

domain of f(x) :

9(x+8)≥0

x+8≥0

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5 0
3 years ago
How to write slope-intercept form through (-1,3) and a slope of -1
oksian1 [2.3K]

The slope-intercept form:

y=mx+b

m - slope

b - y-intercept

We have the slope m = -1 and the point (-1, 3). Substitute:

3=(-1)(-1)+b

3=1+b      <em>subtract 1 from both sides</em>

2=b\to b=2

<h3>Answer: y = -x + 2</h3>
7 0
3 years ago
15 is ______% of 400 part, percent, whole?
Snezhnost [94]

Answer:

15 is 3.75% of 400

Step-by-step explanation:

Hi there!

First we divide 15 by 400 to get 0.0375.

To find the percentage, more the decimal point two spaces to the right.

This would become 3.75

That’s your percentage!

Hope this helped!

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