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3 years ago

Can y’all help me? i’ll literally fail if i don’t get these right lol

Mathematics

1 answer:

ioda3 years ago

5 0

Answer:

63 degrees.

Step-by-step explanation:

TRaingle ABC is isosceles so the base angles are equal That is < BAC = < BCA.

<BAC = 180 - 117 = 63 degrees ( because it is adjacent to <x which is 63 degrees).

So < BCA = <BAC = 63 degrees.

Finally y = 63 degrees ( vertical angles are equal).

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In a book about birds, there is a drawing of a sea eagle that shows a wingspan of 2.8cm. If the picture says the scale is 1:90 w

UNO [17]

In a book about birds, there is a drawing of a sea eagle that shows a wingspan of 2.8 cm. If the book says the scale is 1:90, what is the actual wingspan of the sea eagle.

Answer:

2.52

7 0

3 years ago

A substance abuse researcher wants to know whether reaction time is decreased by frequent alcohol use. He randomly selects 164 a

ella [17]

Answer:

We conclude that the reaction time is increased or remains same by frequent alcohol use.

Step-by-step explanation:

We are given that a substance abuse researcher wants to know whether reaction time is decreased by frequent alcohol use. He randomly selects 164 alcoholics and finds that their mean reaction time (in ms) to a stimulus equals 283.

Reaction times to the stimulus in the general population are distributed normally with a mean equal to 281 and a standard deviation equal to 28.

Let $\mu$ = mean reaction time after alcohol use.

So, Null Hypothesis, $H_0$ : $\mu$ $\geq$ 281 {means that the reaction time is increased or remains same by frequent alcohol use}

Alternate Hypothesis, $H_A$ : $\mu$ < 281 {means that the reaction time is decreased by frequent alcohol use}

The test statistics that would be used here One-sample z test statistics as we know about population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n}}}$ ~ N(0,1)

where, $\bar X$ = sample mean reaction time (in ms) = 283

$\sigma$ = population standard deviation = 28

n = sample of alcoholics = 164

So, test statistics = $\frac{283-281}{\frac{28}{\sqrt{164}}}$

= 0.915

The value of z test statistics is 0.915.

Now, at 0.01 significance level the z table gives critical value of -2.3263 for left-tailed test. Since our test statistics is more than the critical values of z, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region due to which we fail to reject our null hypothesis.

Therefore, we conclude that the reaction time is increased or remains same by frequent alcohol use.

5 0

3 years ago

Find M of angle ABC

pochemuha

Answer:

Step-by-step explanation:

$\sf Answer \begin{cases}\sf \rightarrowtail \:( 3x - 6) + (2x + 25) + (x + 11) = 180 \\ \sf \rightarrowtail \: 3x - 6 + 2x + 25 + x + 11 = 180 \\ \sf \rightarrowtail \: 3x + 2x + x - 6 + 25 + 11 = 180 \\ \sf \rightarrowtail \: 6x + 30 = 180 \\ \sf \rightarrowtail \: 6x = 180 - 30 \\ \sf \rightarrowtail \: 6x = 150 \\ \sf \rightarrowtail \: x = \frac{150}{6} \\ \sf \rightarrowtail \: x = 25\end{cases}$

5 0

3 years ago

There are 12 chocolates in a box of white,milk and dark chocolates.There are 3whites,4 milk and the rest dark chocolates.What is

Luden [163]

Answer:

5/12=.417

Step-by-step explanation:

12-3-4=5 dark ones

6 0

3 years ago

Dan has twice as many stickers as cam does. If Dan gives cam 15 of his stickers he will have 22 more than cam. How many stickers

oksano4ka [1.4K]

Answer:

Initially:

Cam has X stickers.

Dan has 2x.

Dan gives Cam 15 stickers:

Cam has x + 15 stickers.

Dan has 2x - 15 stickers.

2x - 15 = (x + 15) + 22.

X = 52 stickers.

x + 15 = 52 + 15 = 67 stickers.

2x - 15 = 2*52 - 15 = 89 stickers.

Step-by-step explanation:

4 0

3 years ago