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Dovator [93]
3 years ago
14

"when the population standard deviation is unknown, sample size is less than 30, and the population has a normal or near-normal

distribution"
Mathematics
1 answer:
dezoksy [38]3 years ago
5 0
<span>The population standard deviation is unknown, sample size is less than 30, and the population has a normal or near-normal distribution</span>.
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If -xy – 5+ y^2+ x^2= 0 and it is known that dy/dx= y-2x/-x+2y, find all
sleet_krkn [62]

Answer:

There is no point of the form (-1, y) on the curve where the tangent is horizontal

Step-by-step explanation:

Notice that when x = - 1. then dy/dx becomes:

dy/dx= (y+2) / (2y+1)

therefore, to request that the tangent is horizontal we ask for the y values that make dy/dx equal to ZERO:

0 = ( y + 2) / (2 y + 1)

And we obtain y = -2 as the answer.

But if we try the point (-1, -2) in the original equation, we find that it DOESN'T belong to the curve because it doesn't satisfy the equation as shown below:

(-1)^2 + (-2)^2 - (-1)*(-2) - 5 = 1 + 4 + 2 - 5 = 2  (instead of zero)

Then, we conclude that there is no horizontal tangent to the curve for x = -1.

3 0
3 years ago
Simplify the following expression. 12a + 2a
mamaluj [8]

Answer:

14a

Step-by-step explanation:

Combining like-terms gives us 12a+2a=14a

Hope this helped!

6 0
2 years ago
Read 2 more answers
a box of socks contain 5 white socks 3 grey socks 4 black socks and 1 blue sock. is Sophie closes her eyes and randomly pick two
pantera1 [17]

Answer:

3 out of 13 chance of getting grey socks

5 0
3 years ago
Answer ALL if u cant see all the answers it don't matter all u need is the question
bekas [8.4K]
I'm probably wrong but I think A.
4 0
3 years ago
Round each fraction to the nearest half and find the estimate.
erastova [34]

Answer: The result is one half (\frac{1}{2})

Step-by-step explanation:

We have the following expression:

\frac{2}{6}+\frac{1}{6}

Since both fractions have the same denominator, we can just add both numerators and keep the denominator:

\frac{2+1}{6}=\frac{3}{6}

Dividing numerator and denominator by 3:

\frac{\frac{3}{3}}{\frac{6}{3}}=\frac{1}{2} This is the result

3 0
3 years ago
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