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2 years ago

Please tell me the surface area of the composite figure. dont send a virus pls

Mathematics

1 answer:

barxatty [35]2 years ago

7 0

do you want an explanation too or just the answer anyway here's the answer 488

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Factor Completely: 100x2 - 1

fredd [130]

Answer:

Step-by-step explanation:

100x² - 1 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b), thus

100x² - 1

= (10x)² - 1²

= (10x - 1)(10x + 1) → d

3 0

3 years ago

Find the variance of this probability distribution. Round to two decimal places.

attashe74 [19]

Answer:

Variance = 4.68

Step-by-step explanation:

The formula for the variance is:

$\sigma^{2} =\frac{\Sigma(X- \mu)^{2}}{N} \\or \\ \sigma^{2} =\frac{\Sigma(X)^{2}}{N} -\mu^{2} \\$

Where:

$X: Values \\\mu: Mean \\N: Number\ of\ values$

The mean can be calculated as each value multiplied by its probability

$\mu = 0*0.4 + 1*0.3 + 2*0.1+3*0.15+ 4*0.05=1.15$

$\frac{\Sigma (X)^{2}}{N} =\frac{(0^{2}+1^{2}+2^{2}+3^{2}+4^{2})}{5} =6$

Replacing the mean and the summatory of X:

$\sigma^{2} = \frac{\Sigma(X)^{2}}{N} -\mu^{2} \\= 6 - 1.15^{2}\\= 4.6775$

4 0

3 years ago

Express 5/33 as a percent. Round to the nearest tenth.

iris [78.8K]

Rounded to the nearest tenth would be 15.2%.

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3 years ago

Help plz<br> I am so confused

ankoles [38]

The answer to number 18 is - 0.25 or 1/4

If you need help with the other ones ask.

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3 years ago

It is 20 minutes before 8:00 am in the morning. What time is this?

Masja [62]

It is 7:40am in the morning

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3 years ago