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3 years ago

Help me with this lol value of( 2^3)^2

Mathematics

1 answer:

ss7ja [257]3 years ago

6 0

Answer:

Step-by-step explanation:

first, we'll start with the value inside the parenthesis, which is 2³

2³ means to multiply 2 by itself 3 times

so it would be

2×2×2=8

which then means that the expression is now (8)²

now we need to do (8)², which is to multiply 8 by itself twice

8*8=64

hope this helps!

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Find the value of each variable

sesenic [268]

Answer:

x=16

y= 100

Step-by-step explanation:

<1 and <3 are vertical angles so they are equal

5x = 80

Divide each side by 5

5x/5 = 80/5

x = 16

Angles 2 and 3 are supplementary since they form a straight line, they will add to 180

<2 + <3= 180

y+80 = 180

Subtract 80 from each side

y+80-80 = 180-80

y= 100

5 0

3 years ago

In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6997 subjects randomly sele

tankabanditka [31]

Answer:

$z=\frac{0.185 -0.2}{\sqrt{\frac{0.2(1-0.2)}{6997}}}=-3.137$

$p_v =P(z$

Since the p value is very low we have enough evidence to reject the null hypothesis at the significance lvel given of 0.01 so then we can conclude that the return rate ofr this case is significantly lower than 20%

Step-by-step explanation:

Data given

n=6997 represent the random sample taken

X=1296 represent the returned surveys

$\hat p=\frac{1296}{6997}=0.185$ estimated proportion of returned surveys

$p_o=0.2$ is the value that we want to test

z would represent the statistic (variable of interest)

$p_v$ represent the p value (variable of interest)

System of hypothesis

We need to conduct a hypothesis in order to test the claim that the true proportion of returned surveys is less than 0.2.:

Null hypothesis: $p\geq 0.2$

Alternative hypothesis: $p < 0.2$

The statistic is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

Calculate the statistic

Since we have all the info required we can replace in formula (1) like this:

$z=\frac{0.185 -0.2}{\sqrt{\frac{0.2(1-0.2)}{6997}}}=-3.137$

Statistical decision

The next step would be calculate the p value for this test.

Since is a left tailed test the p value would be:

$p_v =P(z$

8 0

3 years ago

Dr. Yancy conducted a correlation study in which she found that the more time children in her study read at home the better they

anzhelika [568]

Answer:

A. Positive

Step-by-step explanation:

They ask us about the relationship between reading and grades.

First you have to go to the first part of the statement that says:

"Dr. Yancy conducted a correlation study in which she found that the more time children in her study read at home the better they performed in school"

In this case they tell us that there is a positive correlation, that the more you read the better your performance in school is.

Performance is your grades, and home study can be reading, so the score is positive in the second half, too.

3 0

3 years ago

Does anyone know the answer for this?

Kazeer [188]

Answer:

8 cm

Step-by-step explanation:

The area of the shaded portion is:

$a = \pi \times (( {r1)}^{2} - {(r2}^{2}))$

A=39π cm^2

r1 is the radius of the large circle

r2=5 cm

So,

$39\pi = \pi \times (( {r1)}^{2} - {5}^{2} ) \\ r1 = 8 \: cm$

5 0

3 years ago

Does 26/3 equal 182/21

Tatiana [17]

Answer:

Yes!

Step-by-step explanation:

26/3 is a seventh of 182/21

Divide 182 and 21 both by 7, and you get 26/3. So, yes, it is equivalent.

8 0

3 years ago