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umka2103 [35]
3 years ago
7

WILL MARK YOU BRAINLIEST

Mathematics
1 answer:
anzhelika [568]3 years ago
5 0

Answer:The area is 14306. 625 cm.

Step-by-step explanation:

To find the area of the circle, we will need to find the diameter and find the radius.

So we know the circumference is  423.9 m and we know to get the circumference, you will need to multiply pie by the diameter .

so now we need divide the circumference by pie to find the diameter.

423.9/ 3.14 = 135  so 135 is the diameter.

To find the radius we need to divide the diameter by 2.

135/2 = 67.5

Now is time to find the area which uses the formula  A= nr^2

A = 3.14 * 67.5^2

A = 14306. 625

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Find the center and radius of the circle. Help !!
Eddi Din [679]

Answer:

the center is -1,1 and the radius is 4 i think

Step-by-step explanation:

7 0
3 years ago
Write the 5th term in the expansion of (5x-y/2)^7
Nezavi [6.7K]

Answer:

65625/4(x^5)(y²)

Step-by-step explanation:

Using binomial expansion

Formula: (n k) (a^k)(b ^(n-k))

Where (n k) represents n combination of k (nCk)

From the question k = 5 (i.e. 5th term)

n = 7 (power of expression)

a = 5x

b = -y/2

....................

Solving nCk

n = 7

k = 5

nCk = 7C5

= 7!/(5!2!) ------ Expand Expression

=7 * 6 * 5! /(5! * 2*1)

= 7*6/2

= 21 ------

.........................

Solving (a^k) (b^(n-k))

a = 5x

b = -y/2

k = 5

n = 7

Substituting these values in the expression

(5x)^5 * (-y/2)^(7-5)

= (3125x^5) * (-y/2)²

= 3125x^5 * y²/4

= (3125x^5)(y²)/4

------------------------------------

Multiplying the two expression above

21 * (3125x^5)(y²)/4

= 65625/4(x^5)(y²)

5 0
3 years ago
A hospital recorded the weights, in ounces, of newborn babies for two weeks. The
Gwar [14]

Answer:

The standard deviation for week two was about 3 ounces more than the standard deviation for week one

Step-by-step explanation:

Given

Week\ 1: 128, 105, 80, 82, 96, 98, 87, 100, 112, 126

Week\ 2: 75, 85, 90, 97, 89, 105, 110, 127, 129, 130

<em>See attachment for options</em>

Required

The true statement

<u>Checking the standard deviation</u>

<u>For week 1</u>

Calculate the mean:

\bar x = \frac{\sum x}{n}

\bar x = \frac{128+ 105+ 80+ 82+ 96+ 98+ 87+ 100+ 112+ 126}{10}

\bar x = \frac{1014}{10}

\bar x_1 = 101.4

Then standard deviation

\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n}}

\sigma_1 = \sqrt{\frac{(128 - 101.4)^2 +............+ (126- 101.4)^2}{10}}

\sigma_1 = \sqrt{\frac{2522.4}{10}}

\sigma_1 = \sqrt{252.24

\sigma_1 = 15.88

For week 2, we have:

\bar x = \frac{75+ 85+ 90+ 97+ 89+ 105+ 110+ 127+ 129+ 130}{10}

\bar x = \frac{1037}{10}

\bar x_2 = 103.7

Then standard deviation

\sigma_2 = \sqrt{\frac{(75 - 103.7)^2 +................+ (130- 103.7)^2}{10}}

\sigma_2 = \sqrt{\frac{3538.1}{10}}

\sigma_2 = \sqrt{353.81

\sigma_2 = 18.81

Compare the standard deviations

\sigma_1 = 15.88

\sigma_2 = 18.81

Calculate the difference:

d = \sigma_2 - \sigma_1

d = 18.81 - 15.88

d = 2.93

d \approx 3

<em>This implies that option (b) is true</em>

4 0
3 years ago
A coin is unbalanced such that it comes up tails 55% of the time.
strojnjashka [21]
A. P[TTTTH] = .55^4*.45 = .0412

<span>b. P[HHHT] = .45^4*.55 = .0226 </span>

<span>c. 1/.45 = 2.222 </span>

<span>d. 1/.55 = 1.818</span>
8 0
3 years ago
How long do the average fist fight last<br><br><br> yes this is actually on my test
tia_tia [17]

Answer:

47 seconds

Step-by-step explanation:

Someone may break it up, it may go on with someone running away but you actually can also look it up on google. I am surprised.

HOPEFULLY THIS HELPS!

6 0
3 years ago
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