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3 years ago

Can someone help me with this question please

Mathematics

2 answers:

Elodia [21]3 years ago

7 0

It's the second one -7x^2 because a quadratic equation needs to be squared and that's the only one that provides that, you can also find the differences of each equation to see if it's quadratic

Karo-lina-s [1.5K]3 years ago

7 0

The answer to this question is B -7x^2-x+2

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The distance from the green point on the parabola to the parabolas focus is 11. What is the distance from green point to the dir

Lina20 [59]

Answer:

answer 11

Step-by-step explanation:

I think it the right answer

4 0

3 years ago

Sample annual salaries (in thousands of dollars) for employees at a company are listed. 42 36 48 51 39 39 42 36 48 33 39 42 45 (

Sonja [21]

Answer:

a) Data given: 42 36 48 51 39 39 42 36 48 33 39 42 45

$\bar X = 41.538$

$s = 5.317$

b) 44.1, 37.8, 50.4, 53.55, 40.95, 44.1, 37.8, 50.4 ,34.65, 40.95, 44.1, 47.25

$\bar X = 43.615$

$s= 5.583$

c) 3.5, 3, 4, 4.25, 3.25, 3.25, 3.5, 3, 4, 2.75, 3.25, 3.5, 3.75

$\bar X= 3.462$

$s = 0.443$

d) As we can see, the average of part b is 1.05 times the average of part a (1.05 * 41.538 = 43.615) and the average of part c is equal to the average obtained in part a divided by 12 (41.538 / 12 = 3.462).

And that happens because we create linear transformations for the parts b and c and the linear transformation affects the mean.

And you have the same interpretation for the deviation, it is affected by the linear transformation as the mean.

Step-by-step explanation:

For this case we can use the following formulas for the mean and standard deviation:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

$s = \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

Part a

Data given: 42 36 48 51 39 39 42 36 48 33 39 42 45

And if we calculate the mean we got:

$\bar X = 41.538$

$s = 5.317$

Part b

For this case we know that each value present a 5% of rise so we just need to multiply each value bu 1.05 and we have this new dataset:

44.1, 37.8, 50.4, 53.55, 40.95, 44.1, 37.8, 50.4 ,34.65, 40.95, 44.1, 47.25

And if we calculate the new mean and deviation we got:

$\bar X = 43.615$

$s= 5.583$

Part c

The new dataset would be each value divided by 12 so we have:

3.5, 3, 4, 4.25, 3.25, 3.25, 3.5, 3, 4, 2.75, 3.25, 3.5, 3.75

And the new mean and deviation would be:

$\bar X= 3.462$

$s = 0.443$

Part d

As we can see, the average of part b is 1.05 times the average of part a (1.05 * 41.538 = 43.615) and the average of part c is equal to the average obtained in part a divided by 12 (41.538 / 12 = 3,462).

And that happens because we create linear transformations for the parts b and c and the linear transformation affects the mean.

And you have the same interpretation for the deviation, it is affected by the linear transformation as the mean.

5 0

3 years ago

PLSSS HELPPPPPPP ASAPPPP I NEED THIS

krek1111 [17]

True because u could divide the number of cubes on the top, front, and left to get how many are in the structure

4 0

2 years ago

I know you want those easy points but this aint easy. please help

jekas [21]

Answer:

Answer Below

Step-by-step explanation:

a. 2L+2W≥40

thats equal to 12+2W≥40 since it says the length is 6

That means 2W≥28

That means width ≥ 14

so the width can be 14 or greater

b. Smallest possible width is 14 because the inequality

6 0

3 years ago

Read 2 more answers

Tanya bought two adult tickets and one children's ticket to a movie for $15.90. Li bought four adult tickets and four children's

Fiesta28 [93]

The answer, hopefully you will understand

6 0

3 years ago