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3 years ago

9

Work out the area of this semicircle with radius 3cm give your answer in terms of pie

2 answers:

azamat3 years ago

5 0

Answer:

Answer=4.5π

Step-by-step explanation:

you square 3 and then divide it by 2 and then just add pi

Hitman42 [59]3 years ago

3 0

Answer:

A=4.5π

The formula for finding a circle is A=πr² so just plug in the value for the radius. Don't forget to divide the entire thing by 2 when you finish, cos it's a semi circle (which is a half circle)

Step-by-step explanation:

Cos Milky Said it.

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A survey is planned to estimate the proportion of voters who support a proposed gun control law. The estimate should be within a

Burka [1]

Complete Question

A survey is planned to estimate the proportion of voters who support a proposed gun control law. The estimate should be within a margin of error of $\pm 5\%$ with 99 %confidence, and we do not have any prior knowledge about the proportion who might support the law. How many people need to be included in the sample?

Answer:

The value is $n = 666$

Step-by-step explanation:

From the question we are told that

The margin of error is $E = 0.05$

From the question we are told the confidence level is 99% , hence the level of significance is

$\alpha = (100 - 95 ) \%$

=> $\alpha = 0.01$

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 2.58$

Here we will assume that the sample proportion of those who support a proposed gun control law to be $\^ p = 0.5$ because from the question they do not have any prior knowledge about the proportion who might support the law

Generally the sample size is mathematically represented as

$n = [\frac{Z_{\frac{\alpha }{2} }}{E} ]^2 * \^ p (1 - \^ p )$

=> $n = 666$

8 0

3 years ago

Find the value of x such that the data set has the given mean.

Feliz [49]

The value of x is 108. If the mean of the data set 100, 122, 107, 115, 107, x is 108.

According to the given question.

We have a data set 100, 122, 105, 115, 107, x .

Also, the mean of the data set is 108.

As we know that, mean is the average of the given numbers and is calculated by dividing the sum of given numbers by the total number of numbers.

Therefore, the mean of the data set 100, 122, 105, 115, 107, x is given by

Mean = [100 + 122 + 107 + 115+ 107 + x]/6

⇒ 108 × 6 = (551 + x)

⇒ 648 = 551 + x

⇒ x = 648 - 551

⇒ x = 97

Hence,the value of x is 108. If the mean of the data set 100, 122, 107, 115, 107, x is 108.

Find out more information about mean here:

brainly.com/question/11163338

#SPJ1

7 0

1 year ago

In which pair do both decimals represent rational numbers?

aleksandr82 [10.1K]

Answer:

Option b

step by step explanation:

5 0

3 years ago

Read 2 more answers

A sequence is defined by the explicit formula an=3n+4 Which recursive formula represents the same sequence of numbers?

fomenos

Answer:

Option (3)

Step-by-step explanation:

Explicit formula of the sequence is,

$a_n=3^n+4$

From this explicit formula,

First term of the sequence will be,

$a_1=(3^1)+4$

$a_1=7$

Second term of the sequence,

$a_2=(3^2)+4$

$a_2$ = 13

3rd term of the sequence,

$a_{3}=(3^3)+4$

= 31

Sequence formed,

7, 13, 31 ..........

From the given options,

Recursive formula,

$a_n=3a_{n-1}-8$

$a_2=3(a_1)-8$

$a_2=3(7)-8$

$a_2=21-8$ = 13

$a_3=3a_2-8$

$a_3=3a_2-8$

$a_3=3(13)-8$

= 39 - 8

= 31

Sequence formed from this recursive formula will be,

7, 13, 31........

Therefore, Option (3) will be the answer.

5 0

3 years ago

Like the other qs I asked, I know this is alot but I really need help. I can admit I am terrible at math, like totally terible,

Romashka-Z-Leto [24]

Wait so Brainly doesn’t have answers for this ?

6 0

3 years ago