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3 years ago

Factor the following trinomials x2-18x+81

Mathematics

2 answers:

poizon [28]3 years ago

4 0

Answer:

(x - 9)(x - 9)

Step-by-step explanation:

<em>Hey there!</em>

Well to factor,

x^2-18x+81

we need to figure out what times what equal 81 and adds together to get -18.

-9*-9 = 81

-9 + -9 = -18

x*x = x^2

Factored - (x - 9)(x - 9)

<em>Hope this helps :)</em>

Karolina [17]3 years ago

3 0

X = 9.
This is found using the MAN strategy, and can be proven by subbing 9 into the equation for x and the solution equaling zero.

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Assuming the population of interest is approximately normally distributed, construct a 95% confidence interval estimate for th

nikklg [1K]

Answer: $(17.96,20.64)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline{x}\ \pm\ t_{n-1,\alpha/2}\dfrac{s}{\sqrt{n}}$

Given : $\overline{x}=19.3$

$s= 3.1$

n=23, which is a small sample(n<30), so we use t-test.

Significance level: $1-0.95=0.05$

Critical value : $t_{n-1,\alpha/2}=t_{22,0.025}=2.074$

Then , the confidence interval for population mean will be :-

$19.3\ \pm\ (2.074)\dfrac{3.1}{\sqrt{23}}\\\\\approx19.3\pm1.34\\\\=(19.3-1.34,19.3+1.34)\\\\=(17.96,20.64)$

Hence, the 95% confidence interval for the population mean is $(17.96,20.64)$

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3 years ago

Tim’s age ,t, is not 21 years old

Fofino [41]

I’m sorry I don’t understand is there more to the question?

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4 years ago

Read 2 more answers

8 please and thank u

pishuonlain [190]

Answer:

About 5

Step-by-step explanation:

2/3 times 7 is 4.66666666667

Round that up to 5

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3 years ago

Can two data sets have the same mean but different standard deviations?

agasfer [191]

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3 years ago

The point (-2, 4) is on the line given by which equation below

Zanzabum

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