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kotegsom [21]
3 years ago
13

How can we know that number or the answer without calculator ?​

Mathematics
2 answers:
Nimfa-mama [501]3 years ago
6 0

Answer:

through factorisization

Step-by-step explanation:

hope it helps

Tamiku [17]3 years ago
5 0

Answer:

factorization

Step-by-step explanation:

Have a good day :)

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<img src="https://tex.z-dn.net/?f=%28%20-%20%2055%292" id="TexFormula1" title="( - 55)2" alt="( - 55)2" align="absmiddle" clas
Art [367]
The answer is -110.
This is because -55-55=-110.
You have to put -55-55 because the question is asking for you to multiply -55 twice, which is technically-55-55.
8 0
3 years ago
Read 2 more answers
g A sample of 3 items is chosen at random from a box containing 20 items, out of which 4 are defective. Let X be the number of d
professor190 [17]

Answer:

The variance and standard deviation of <em>X</em> are 0.48 and 0.693 respectively.

The variance and standard deviation of (20 - <em>X</em>) are 0.48 and 0.693 respectively.

Step-by-step explanation:

The variable <em>X</em> is defined as, <em>X</em> = number of defective items in the sample.

In a sample of 20 items there are 4 defective items.

The probability of selecting a defective item is:

P (X)=\frac{4}{20}=0.20

A random sample of <em>n</em> = 3 items are selected at random.

The random variable <em>X</em> follows a Binomial distribution with parameters <em>n</em> = 3 and <em>p </em>= 0.20.

The variance of a Binomial distribution is:

V(X)=np(1-p)

Compute the variance of <em>X</em> as follows:

V(X)=np(1-p)=3\times0.20\times(1-0.20)=0.48

Compute the standard deviation (σ (X)) as follows:

\sigma (X)=\sqrt{V(X)}=\sqrt{0.48}=0.693

Thus, the variance and standard deviation of <em>X</em> are 0.48 and 0.693 respectively.

Now compute the variance of (20 - X) as follows:

V(20-X)=V(20)+V(X)-2Cov(20,X)=0+0.48-0=0.48

Compute the standard deviation of (20 - X) as follows:

\sigma (20-X)=\sqrt{V(20-X)} =\sqrt{0.48}0.693

Thus, the variance and standard deviation of (20 - <em>X</em>) are 0.48 and 0.693 respectively.

3 0
3 years ago
The question is what is 4p - 9
OlgaM077 [116]

Answer:

4xp-9

Step-by-step explanation:

4 0
2 years ago
If u=(0,3), what is the magnitude of 3u
Rina8888 [55]

Answer:

<em>9.</em>

Step-by-step explanation:

3 * √)0^2 + 3^2)

= 3*3

= 9.

4 0
3 years ago
The amount $0.8982 rounded to nearest cent is? ​
Butoxors [25]

Answer:

It would be rounded to $0.90

Step-by-step explanation:

The 9 would make the 8 go up to $0.90

4 0
3 years ago
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