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2 years ago

Pls help Im confused.

Mathematics

2 answers:

kramer2 years ago

6 0

Answer:

x = 13

Step-by-step explanation:

If they are parallel, that means that the angles shown are congruent.

If they are congruent, you can find the unit rate of x.

7x-1

is equal to

8x-14

7x - 1 = 8x - 14

Isolate x

-1 = 8x - 7x - 14

-1 + 14 = 8x - 7x

Simplify

13 = 1x

x = 13

Oksana_A [137]2 years ago

4 0

The answer is x=13 because the equations equal each other

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1) Lithium isotope rations are important to medicine, the 6Li/7Li ratio in a standard reference material was measured several ti

uysha [10]

Answer:

1) $0.0826052-2.776\frac{0.000013424}{\sqrt{5}}=0.082588$

$0.0826052+2.776\frac{0.000013424}{\sqrt{5}}=0.0826219$

b) $ME= 2.776\frac{0.000013424}{\sqrt{5}}=0.0000166653$

And we want 2/3 of the margin of error so then would be: $2/3 ME = 0.00001111$

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

And on this case we have that ME =0.00001111016 and we are interested in order to find the value of n, if we solve n from equation (1) we got:

$n=(\frac{z_{\alpha/2} s}{ME})^2$ (2)

Replacing we got:

$n=(\frac{2.776(0.000013424)}{0.00001111})^2 =11.25 \approx 12$

So the answer for this case would be n=12 rounded up to the nearest integer

Step-by-step explanation:

Information given

0.082601, 0.082621, 0.082589, 0.082617, 0.082598

We can calculate the sample mean and deviation with the following formulas:

$\bar X= \frac{\sum_{i=1}^n X_i}{n}$

$s = \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

$\bar X=0.0826052$ represent the sample mean

$\mu$ population mean

s=0.000013424 represent the sample standard deviation

n=5 represent the sample size

Part 1

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom, given by:

$df=n-1=5-1=4$

The Confidence level is 0.95 or 95%, and the significance would be $\alpha=0.05$ and $\alpha/2 =0.025$ , the critical value would be using the t distribution with 4 degrees of freedom: $t_{\alpha/2}=2.776$

Now we have everything in order to replace into formula (1):

$0.0826052-2.776\frac{0.000013424}{\sqrt{5}}=0.082588$

$0.0826052+2.776\frac{0.000013424}{\sqrt{5}}=0.0826219$

Part 2

The original margin of error is given by:

$ME= 2.776\frac{0.000013424}{\sqrt{5}}=0.0000166653$

And we want 2/3 of the margin of error so then would be: $2/3 ME = 0.00001111$

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

And on this case we have that ME =0.00001111016 and we are interested in order to find the value of n, if we solve n from equation (1) we got:

$n=(\frac{z_{\alpha/2} s}{ME})^2$ (2)

Replacing we got:

$n=(\frac{2.776(0.000013424)}{0.00001111})^2 =11.25 \approx 12$

So the answer for this case would be n=12 rounded up to the nearest integer

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3 years ago

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Answera A

Step-by-step explanation:

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2 years ago

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Which number is equal to 7times 100+2times 1over 10+5times 1over 100?????????

Sergeu [11.5K]

7*100+2*1= 702
10+5*1= 15
702+15= 717
i hope that is really does help if it don't i am sorry

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3 years ago

Brian irons 2/9 of his his shirt in 3 3/5 Brian irons at a constant rate at this rate hou much of his shirt is ironed each minut

VashaNatasha [74]

(2/9 shirt)/(3 3/5 minute)
= (2/9)/(18/5) shirt/minute
= (2/9)*(5/18) shirt/minute
= 5/81 shirt/minute

5/81 of Brian's shirt is ironed each minute

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It will take Brian 16 1/5 minutes to iron his shirt.

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3 years ago

Maya has 9 books 1/3 of her books are fairy tales how many of Mayas books are fairy tales

posledela

Answer:

Step-by-step explanation:

1/3 of 9 is 3

you would figure this out by dividing the total amount of books by the denominator of the fraction.

9/3=3

8 0

3 years ago

Pls help Im confused.​

Pls help Im confused.