3 years ago

Help me just pls help me I needed so bad

Mathematics

1 answer:

aleksandr82 [10.1K]3 years ago

3 0

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Solve for f f+0.2=−3 a. f= -3.2 b. f= -2.8 c. f=2.8 d.f=3.2

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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 $\frac{21}{128}$ .

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3 years ago

Do I use LCM or HCF? And how can I decide which to use? (Brainliest if you can answer the whole thing)

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Answer:

As far as i know you should go for LCM that would be more convenient and easy to do

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3 years ago

Erica watched 2.7 miles to and from work every day for an entire year how many miles did he walk

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2.7 • 2 because it’s twice a day. He’s waking 5.4 miles daily, 5.4 • 360 = 1,944 miles yearly.

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4 years ago