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Nezavi [6.7K]
3 years ago
12

There are 9 students in a class: 7 boys and 2 girls.

Mathematics
2 answers:
Lilit [14]3 years ago
5 0
I think the teacher would probably pick two boys and one girl
Mrrafil [7]3 years ago
3 0

Answer:

Step-by-step explanation:

There are 9C3 total ways of picking 3 people from 9 where order does not matter.

To pick 3 boys from 6, you must do 6C3

When you do both of these you divide the smaller by the larger.

9C3 = 84

6C3 = 20

So the probability that you want is

20/84 = 0.238

If you are uncertain where the 84 comes from, it is calculated like this

9*8*7*6!       The  6!s cancel out and you are left with

=======

6! * (9 -6)!

9C3 = 9*8*7/3!

9C3 = 3 * 4 * 7 = 84

6C3 is done exactly the same way.

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Evaluate f(x)=7x+7 when x=-9
stealth61 [152]

Answer:

-56

Step-by-step explanation:

f(x) = 7x + 7

x = -9

We meed to plug in x = -9 into the first equation:

f(-9) = 7(-9) + 7

We can open up the parentheses:

f(-9) = -63 + 7

And then simplify:

f(-9) = -56

7 0
3 years ago
H function is even, odd, or neither.<br> b. g(x) = x² - 2<br> Is it odd or even
o-na [289]

g(x) = x^2 - 2 \text{ is even function }

<em><u>Solution:</u></em>

Given that,

g(x) = x^2 - 2

We have to find whether the above function is odd or even

If a function is: y = f(x)

If f(-x) = f(x), the function is even

If f(-x) = - f(x), the function is odd

Which is,

\mathrm{Even\:Function:\:\:A\:function\:is\:even\:if\:}f\left(-x\right)=f\left(x\right)\mathrm{\:for\:all\:}x\in \mathbb{R}\\\\\mathrm{Odd\:Function:\:\:A\:function\:is\:odd\:if\:}f\left(-x\right)=-f\left(x\right)\mathrm{\:for\:all\:}x\in \mathbb{R}

From given,

g(x) = x^2 - 2

Replace x with -x

g(-x) = (-x)^2 - 2\\\\g(-x) = x^2 - 2

Therefore,

g(x) = g(-x)

Thus the function g(x) is even

4 0
3 years ago
Please help
JulsSmile [24]

Answer:

correct

Step-by-step explanation:

6 0
2 years ago
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jose pack54 CDs into smallboxes. Each box holdsome 9 CDS . how many boxes does jose pack to hold all 54 CDs
andreyandreev [35.5K]
45
CDS..................
3 0
3 years ago
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Express the interval shown on the number line in inequality notation.
Bess [88]

Answer: x < -3 or x > 5

Step-by-step explanation: Interval notation shows the values of x. X is less than -3, or greater than 5.

6 0
3 years ago
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