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3 years ago

.Find the square root of the following numbers by division method. b) 9216

Mathematics

2 answers:

AysviL [449]3 years ago

7 0

Answer:96

Step-by-step explanation:

Fiesta28 [93]3 years ago

7 0

Step-by-step explanation:

Hope it helps you in your learning process.

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What is the simplified expression for 2 (x minus 5)?

sp2606 [1]

Answer:

2x-10

Step-by-step explanation:

you have to distribute your parentheses to the 2

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3 years ago

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Set A of six numbers has a standard deviation of 3 and set B of four numbers has a standard deviation of 5. Both sets of numbers

Alenkinab [10]

Given:

$\sigma_A=3$

$n_A=6$

$\sigma_B=5$

$n_B=4$

$\overline{x}_A=\overline{x}_B$

To find:

The variance. of combined set.

Solution:

Formula for variance is

$\sigma^2=\dfrac{\sum (x_i-\overline{x})^2}{n}$ ...(i)

Using (i), we get

$\sigma_A^2=\dfrac{\sum (x_i-\overline{x}_A)^2}{n_A}$

$(3)^2=\dfrac{\sum (x_i-\overline{x}_A)^2}{6}$

$9=\dfrac{\sum (x_i-\overline{x}_A)^2}{6}$

$54=\sum (x_i-\overline{x}_A)^2$

Similarly,

$\sigma_B^2=\dfrac{\sum (x_i-\overline{x}_B)^2}{n_B}$

$(5)^2=\dfrac{\sum (x_i-\overline{x}_B)^2}{4}$

$25=\dfrac{\sum (x_i-\overline{x}_B)^2}{4}$

$100=\sum (x_i-\overline{x}_B)^2$

Now, after combining both sets, we get

$\sigma^2=\dfrac{\sum (x_i-\overline{x}_A)^2+\sum (x_i-\overline{x}_B)^2}{n_A+n_B}$

$\sigma^2=\dfrac{54+100}{6+4}$

$\sigma^2=\dfrac{154}{10}$

$\sigma^2=15.4$

Therefore, the variance of combined set is 15.4.

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3 years ago

The number 16 has two square roots: 4 and

maw [93]

Answer:

4 and -4 are both the square roots of 16

Step-by-step explanation:

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3 years ago

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34. The diagram shows a sector of a circle of radius 10 cm.

Sergio [31]

Answer:

rc length = 10 * 8pi/5

= 16pi

This is the circumference of the base

(a) 2pir = 16pi where r = radius of base

2r = 16

r = 8 cm

(b) 10^2 = h^2 + 8^2

h^2 = 100 - 64

= 36

h = 6 cm

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3 years ago

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That copy machine is quick! It copied 90 pages in 3 minutes. How many copies can it make in 1 minute?

earnstyle [38]

Answer:

30 copies.

Step-by-step explanation:

Let's represent p as pages and c as copies

90p = 3 m

m = 90/3

m = 30

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