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erma4kov [3.2K]
2 years ago
12

Please help me with this question

Mathematics
1 answer:
monitta2 years ago
4 0
5(1)-3=2

5(2)-3=7

5(3)-3=12

5(4)-3=17
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Evaluate C_n.xP^xQn-x For the given n=7, x=2, p=1/2
r-ruslan [8.4K]

Answer:

The value of given expression is \frac{21}{128}.

Step-by-step explanation:

Given information: n=7, x=2, p=1/2

q=1-p=1-\frac{1}{2}=\frac{1}{2}

The given expression is

C(n,x)p^xq^{n-x}

It can be written as

^nC_xp^xq^{n-x}

Substitute n=7, x=2, p=1/2 and q=1/2 in the above formula.

^7C_2(\frac{1}{2})^2(\frac{1}{2})^{7-2}

\frac{7!}{2!(7-2)!}(\frac{1}{2})^2(\frac{1}{2})^{5}

\frac{7!}{2!5!}(\frac{1}{2})^{2+5}

\frac{7\times 6\times 5!}{2\times 5!}(\frac{1}{2})^{2+5}

21(\frac{1}{2})^{7}

\frac{21}{128}

Therefore the value of given expression is \frac{21}{128}.

7 0
3 years ago
Jillian measured the distance around a small fish pond as 27 yards. Which would be a good estimate for the distance across the p
DochEvi [55]
Assuming the fish pond is round, what you're given is the circumference.
So you know that 2<span>πr = 27.
We want to solve for the diameter, or d = 2r. We should isolate that.
2r = 27/</span><span>π
2r = 8.59 yards, or ~9 yards.</span>
3 0
3 years ago
What is the answer (6√2)(-3√5)
alexgriva [62]

Solution:

- 18 \sqrt{10}

<h3>Step-by-step explanation:</h3>

<h3>1. Apply rule : a(-b) = -ab</h3>

<h3> </h3>

=  - 6 \sqrt{2}   \:  \: • \:  \: 3 \sqrt{5}

2. Apply radical rule : \sqrt{a}  \sqrt{b}  =  \sqrt{ab} , a \geqslant 0, b

=  6 \sqrt{2 \: • \: 5}  \: • \: 3

<h3>3.Multiply the numbers : 2 • 5 = 10</h3>

=6 \sqrt{10} •3

<h3>4.Multiply the numbers : - 6 • 3= - 18</h3>

=  - 18 \sqrt{10}

7 0
2 years ago
PLS HELP
lutik1710 [3]

Answer:

Step-by-step explanation:

95%+15%=110% so, 110%-100% is 10% and this means that 10% of both, costs 1.20. now, 10 times 1.20 is 12 dollars and we know that the whole purchace costs 12 dollars. 15 percent of 12 dollars is 1.8 dollars or, one dollar and 80 cents

3 0
2 years ago
Which equation demonstrates the associative property of multiplication?
kicyunya [14]

Answer:

A

Step-by-step explanation:

The parentheses are switched around, making the answer still the same. However, for Answer choice C, it is Commutative Property because the factors are switched around.

6 0
3 years ago
Read 2 more answers
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