Ask question

Ask question

All categories

3 years ago

14

Which statement about proportional relationships is false? A proportional relationship must graph as a line. A graph of a propor

tional relationship must pass through (0, 0). Each point (or pair) in a proportional relationship must share the same ratio. Each point (or pair) in a proportional relationship must share the same difference.

2 answers:

kogti [31]3 years ago

8 0

Answer: It's D

Step-by-step explanation:

natka813 [3]3 years ago

4 0

Answer:

<u><em>D:</em></u> Each point (or pair) in a proportional relationship must share the same difference.

You might be interested in

An article reported that for a sample of 52 kitchens with gas cooking appliances monitored during a one-week period, the sample

kolbaska11 [484]

Answer:

a) $654.16-2.01\frac{164.55}{\sqrt{52}}=608.29$

$654.16+2.01\frac{164.55}{\sqrt{52}}=700.03$

And we can conclude that we are 95% confident that the true mean of Co2 level is between 608.29 and 700.03 ppm

b) $n=(\frac{1.960(175)}{25})^2 =188.23 \approx 189$

Step-by-step explanation:

Part a

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

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

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=52-1=51$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,51)".And we see that $t_{\alpha/2}=2.01$

Replacing we got:

$654.16-2.01\frac{164.55}{\sqrt{52}}=608.29$

$654.16+2.01\frac{164.55}{\sqrt{52}}=700.03$

And we can conclude that we are 95% confident that the true mean of Co2 level is between 608.29 and 700.03 ppm

Part b

The margin of error is given by :

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

The desired margin of error is ME =50/2=25 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

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

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025;0;1)", and we got $z_{\alpha/2}=1.960$ , and we use an estimator of the population variance the value of 175 replacing into formula (b) we got:

$n=(\frac{1.960(175)}{25})^2 =188.23 \approx 189$

6 0

3 years ago

3 friends share 6 pounds of grapes equally. Each pound has 40 grapes. How many grapes does each friend get

GuDViN [60]

Answer:

80 grapes

Step-by-step explanation:

6 pounds x 40 = 240

240 / 3 = 80

or you can do:

6 / 3 = 2

2 x 40 = 80

4 0

2 years ago

Whats the prime factorization for 59. Also whats the factorization for 61. Thank chu!

Ainat [17]

1,59 and 1,61 are the prime factoratiozons for 59 and 61

8 0

3 years ago

Marina86 [1]

Answer:

$cos{\frac{2\pi}{3}}=-\frac{1}{2}$ .

Reference angle is $\frac{\pi}{3}$

Step-by-step explanation:

Given the value of x. we have to find the correct value of cosx.

$x=\frac{2\pi}{3}$

Now, we have to find the exact value of $cos{\frac{2\pi}{3}}$

$cos{\frac{2\pi}{3}}=cos(\frac{\pi}{2}+\frac{\pi}{6})$

$=-sin(\frac{\pi}{6})$

$=-\frac{1}{2}$

Now, we have to find the reference angle of $x=\frac{2\pi}{3}$ .

Since the angle $x=\frac{2\pi}{3}$ lies in second quadrant, the reference angle formula is

Reference angle= $\pi-given angle$ .

= $\pi-\frac{2\pi}{3}=\frac{\pi}{3}$

3 0

3 years ago

What is 5x – 8x + 2 + 5=

nikklg [1K]

Answer: -3x+7

Step-by-step explanation: Good luck! :D

3 0

3 years ago

Read 2 more answers