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3 years ago

Can some one please help cause I don't understand it

Mathematics

2 answers:

lilavasa [31]3 years ago

8 0

The answer is the (It’s the last two.)

Enjoy :)

lianna [129]3 years ago

8 0

C and D
It is what the other person said, but you can still mark them brainliest

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20 POINTS!!!!!! SOLVE FOR X

WITCHER [35]

Answer:

All you have to do is equal the equations to each other to find x for each problem!

Step-by-step explanation:

Hope this helps bestieee!

8 0

3 years ago

Calculate the sample variance and sample standard deviation for the following frequency distribution of heights in centimeters f

Zolol [24]

Answer:

$\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{22026.1}{171}=128.81$

$s^2 = \frac{2839948.85- \frac{(22026.1)^2}{171}}{171-1}= 16.59$

$s= \sqrt{16.587}=4.07$

Step-by-step explanation:

For this case we can calculate the sample variance and deviation with the following table

Class Midpoint (Xi) fi Xi*fi Xi^2 *fi

120.6-123.6 122.1 17 2075.7 253443

123.7-126.7 125.2 49 6134.8 768077

126.8-129.8 128.3 29 3720.7 477365.8

129.9-132.9 131.4 41 5387.4 707904.4

133.0-136.0 134.5 35 4007.5 633158.8

___________________________________________

Total 171 22026.1 2839948.85

For this case we can calculate the mean or expected value with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{22026.1}{171}=128.81$

Now we can calculate the sample variance with the following formula:

$s^2 =\frac{\sum f_i X^2_i -[\frac{(\sum X_i f_i)}{n}]^2}{n-1}$

And if we replace we got:

$s^2 = \frac{2839948.85- \frac{(22026.1)^2}{171}}{171-1}= 16.59$

And the standard deviation would be the square root of the variance and we got:

$s= \sqrt{16.59}=4.07$

7 0

4 years ago

A, b and c stand for three different numbers

creativ13 [48]

To find the mean, you add up the numbers and divide by
how many numbers there are.

So if the mean of 'A' and 'B' is 40, then A + B = 80 .
And if the mean of 'B' and 'C' is 35 then B + C = 70.
==========================================
You said that (A + B) + C = 100 .

From something else that you said, I noticed that A + B = 80 .

So I can write (80) + C = 100

Subtract 80 from each side: C = 20
==========================================
I also noticed, from what you said, that B + C = 70 .

So I can write B + 20 = 70

Subtract 20 from each side: B = 50
==========================================
Now I know that C = 20 and B = 50.

Finally, you said that A + B + C = 100 ,

So I can write A + 50 + 20 = 100

Combine like terms on the left: A + 70 = 100

Subtract 70 from each side: A = 30
==========================================

  A = 30
 B = 50
 C = 20

5 0

4 years ago

The coefficient of x in -7xy is -7

Oksanka [162]

Answer:

True: the leading coefficient in the monomial is -7

Step-by-step explanation:

Math

5 0

3 years ago

I need help this is needed by tomorrow morning :)

zhuklara [117]

I think it’s 1/48 :)

4 0

3 years ago

Read 2 more answers