3 years ago

Need help :( plsssssssssss

Mathematics

1 answer:

salantis [7]3 years ago

4 0

Answer:

The polygon is a triangle, and is not a regular polygon.

Step-by-step explanation:

The polygon is a triangle because of it's three sides. It's also a non regular polygon since it's no equilateral or equiangular.

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An SRS of 450 450 high school seniors gained an average of ¯ x = 20 x¯=20 points in their second attempt at the SAT Mathematics

maria [59]

Answer: (15.47, 24.53)

Step-by-step explanation:

We know that the confidence interval for population mean is given by :_

$\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}$

, where n= sample size.

$\sigma$ = standard deviation.

$\overline{x}$ = sample mean.

z*= Critical value.

Given : n= 450

$\overline{x}=20$

$\sigma=49$

Critical value for 95% confidence = z*=1.96 [From z-value table]

Then, the 95% confidence interval will be :-

$20\pm (1.96)\dfrac{49}{\sqrt{450}}$

$\approx 20\pm (1.96)(2.31)$

$\approx 20\pm 4.53$

$=(20-4.53,\ 20+4.53)=(15.47,\ 24.53)$

Hence, the 95% confidence interval for the mean change in score μ μ in the population of all high school seniors. : (15.47, 24.53)

3 0

3 years ago

PLEASE HELP I don’t know what I’m doing lol

Svetradugi [14.3K]

Answer:

I would say soild 2 because is has the most even ammount of the 4.

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3 years ago

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The formula d=rt relates three quantities distance (d) rate (r) and time (t)

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B)5

c) aprox. 55.5 or 55.6

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4 years ago

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Please help!!! Will mark brainliest answer if correct!!!!

AlekseyPX

Answer:

x=4 and y=2

Step-by-step explanation:

Name the triangles as ABC and DEF,

Now, since both the triangles are congruent by HL rule, therefore

$3y=x+2$ (1)

and $x=y+2$ (2)

Substituting the value of $x=y+2$ in equation (1), we get

$3y=y+2+2$

$2y=4$

$y=2$

Therefore, Putting y=2 in equation (2),

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The table shows the results of a survey on the number of text messages per month for people of different ages. Based on this sur

Rzqust [24]

Answer:C

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