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2 years ago

What is the completely factored form of x^4y- 4xły - 5y?

Mathematics

1 answer:

tamaranim1 [39]2 years ago

3 0

If you mean by completely factored form of x^4y - 4x2y - 5y

Then the answer is y (x^2 - 5) (x^2 + 1)

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In a population distribution, a score of x=57 corresponds to z=-0.25 and a score of x=87 corresponds to z=1.25. Find the mean an

Serggg [28]

Here is dependence between scores and x-values:

$Z_i=\dfrac{X_i-\mu}{\sigma},$

where $\mu$ is the mean, $\sigma$ is standard deviation and i changes from 1 to 2.

1. When i=1, $Z_1=-0.25,\ X_1=57,$ then

$-0.25=\dfrac{57-\mu}{\sigma}.$

2. When i=2, $Z_2=1.25,\ X_2=87,$ then

$1.25=\dfrac{87-\mu}{\sigma}.$

Now solve the system of equations:

$\left\{\begin{array}{l}-0.25=\dfrac{57-\mu}{\sigma}\\ \\1.25=\dfrac{87-\mu}{\sigma}.\end{array}\right.$

$\left\{\begin{array}{l}-0.25\sigma=57-\mu\\ \\1.25\sigma=87-\mu.\end{array}\right.$

Subtract first equation from the second:

$1.25\sigma-(-0.25\sigma)=87-57,\\ \\1.5\sigma=30,\\ \\\sigma=20.$

Then

$1.25=\dfrac{87-\mu}{20},\\ \\87-\mu=25,\\ \\\mu=87-25=62.$

Answer: the mean is 62, the standard deviation is 20.

3 0

3 years ago

Read 2 more answers

Jonathan says that when you add

sergij07 [2.7K]

oh ok alr thank you so much

8 0

2 years ago

Which expression is equivalent to 3/4 1/2

d1i1m1o1n [39]

Answer:

kkk

Step-by-step explanation:

kkkkkkhjhj

3 0

3 years ago

How many eights are there in 6 1/2

Alona [7]

There are (8) eighths in 1, so multiply this by 6 1/2 to determine how many eighths there are:

8*6.5 = <u><em>52 eighths</em></u> in 6 1/2

5 0

3 years ago

Read 2 more answers

-8x times 5 to the power of 3 would equal -1000x right?

marusya05 [52]

No. If you write it out, it would be -8*5 which is -40. (-40)^3 is -64000. So your answer would be -64000x

4 0

2 years ago