2 years ago

(y2 + 5y - 14/y2 + 4y - 21)

Mathematics

2 answers:

ANTONII [103]2 years ago

7 0

The expression simplified would be y^2+9y - 14/y^2 - 21

nika2105 [10]2 years ago

6 0

1 super sorry im to lazy to do the work but its 1

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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:

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

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3 years ago

The type of equation given below is in point-slope form <br> y=1/2x-5 true or false

kykrilka [37]

Answer:

false

Step-by-step explanation:

point slope form : y - y1 = m( x - x1 )

the equation y = 1/2x - 5 does not follow this therefore the answer is false

the equation y = -1/2x - 5 is instead put in slope intercept form , y = mx + b

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2 years ago

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3 years ago

Read 2 more answers

If C = x2 + 8x + 3 and B = x – 8, find an expression that equals 3C + B in<br> standard form.

oksano4ka [1.4K]

Answer: 3x^2 + 25x + 1

Step-by-step explanation:

3C + B

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=> 3x^2 + 24x + 9 + x - 8

=> 3x^2 + 25x + 1

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3 years ago

⎩ ⎪ ⎪ ⎨ ⎪ ⎪ ⎧ a(1)=−13 a(n)=a(n−1)+4 Find the 2nd2^{\text{nd}} 2 nd 2, start superscript, start text, n, d, end text, end su

Fofino [41]

Answer:

a(2) = -9

Step-by-step explanation:

It looks like you want the 2nd term in the arithmetic sequence defined by the recursive formula ...

a(1) = -13
a(n) = a(n -1) +4

Using the formula with n=2, we have ...

a(2) = a(1) +4

a(2) = -13 +4 . . . . substitute the value of a(1)

a(2) = -9

8 0

3 years ago

(y2 + 5y - 14/y2 + 4y - 21)​

(y2 + 5y - 14/y2 + 4y - 21)