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Zielflug [23.3K]
3 years ago
11

X^2-2y/y when x=20 and y=x/2

Mathematics
2 answers:
DerKrebs [107]3 years ago
4 0

Answer:

I believe its 398

Step-by-step explanation:


vagabundo [1.1K]3 years ago
3 0

Answer:

398

Step-by-step explanation:

x^2=400

substitute for y, 2y/y=(2*x/2)/(x/2)=x/(x/2)=x*(2/x)=2

400-2=398

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A study of parents of kindergarteners included 349 parents who were chosen at
miskamm [114]

Answer:

47% is the statistic and 31% is the parameter.

Step-by-step explanation:

A parameter is a quantity of a variable representing certain characteristic of a population.

A statistic is a quantity of a variable representing certain characteristic of a sample.

The sample of parents of kindergartners selected is, <em>n</em> = 345.

The School records show that only 31% of parents of kindergartners sent their children to pre-kindergarten.

That is the population proportion is, <em>p</em> = 0.31.

This is the parameter value.

Of the 349 parents, 47% said they sent their children to pre-kindergarten.

That is the sample proportion is, \hat p = 0.47.

This is the statistic value.

Thus, the correct option is:

47% is the statistic and 31% is the parameter.

7 0
3 years ago
3/9 as a decimal rounded to 3 decimal places
goblinko [34]
3/9 = 0.3333333336 ~ 0.333
8 0
3 years ago
Given that ABC~LMN<br> What is the length of AC?
sleet_krkn [62]

Answer:

B. 12

Step-by-step explanation:

✔️Find the value of x

The side lengths of two similar triangles are always proportional.

Given that ∆ABC ~ ∆LMN, therefore:

\frac{AB}{LM} = \frac{AC}{LN}

AB = 5

LM = 10

AC = x + 5

LN = 3x + 3

Plug in the values

\frac{5}{10} = \frac{x + 5}{3x + 3}

Cross multiply

5(3x + 3) = 10(x + 5)

15x + 15 = 10x + 50 (distributive property)

Collect like terms

15x - 10x = -15 + 50

5x = 35

Divide both sides by 5

x = 7

✔️Find AC

AC = x + 5

Plug in the value of x

AC = 7 + 5

AC = 12

6 0
3 years ago
X+9 divided by 3 equals 8
kykrilka [37]

Answer: 15

Step-by-step explanation:

I am assuming the equation is set up like this:

(x+9)/3 = 8

Multipy by 3 to both sides

x + 9 = 24

Subtract 9

x = 15

8 0
3 years ago
Read 2 more answers
Practice: reflecting points in the coordinate plane ​
zmey [24]

letter a is -1,3

its pretty easy

5 0
3 years ago
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