3 years ago

9 30

Mathematics

1 answer:

In-s [12.5K]3 years ago

6 0

You must be dumb and have no friends

Answer:I feel bad for you

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If there is a positive correlation between number of years studying math and shoe size (for children), does that prove that lar

stealth61 [152]

Answer:

The hidden variable is age.

Step-by-step explanation:

That does not prove that larger shoes cause more studying math or vice versa.

The children with larger shoes are most probably older so they would have done more years of studying than the younger ones.

The hidden variable is the age of the child.

8 0

3 years ago

how many students are good in mathematics only and how many students are not good in any of the three courses

cricket20 [7]

Answer:

do you have a graph to go along with this?

7 0

3 years ago

Factor x3y6 + 27z42. (xy3 + 3z39)(x2y9 – 3xy3z39 + 9z1,521) (xy3 + 3z39)(x2y6 – 3xy3z39 + 9z78) (x3y6 + 27z42)(x6y12 – 27x3y6z42

Licemer1 [7]

Answer:

$x^3y^6 + 27z^{42} = (xy^2 + 3z^{14})(x^2y^4 - 3xy^2z^{14} + 9z^{28})$

Step-by-step explanation:

Given

$x^3y^6 + 27z^{42$

Required

Factor

Express both terms as a cube

$x^3y^6 + 27z^{42} = (xy^2)^3 + (3z^{14})^3$

Let

$a =(xy^2)$

$b = (3z^{14})$

So:

$x^3y^6 + 27z^{42} = a^3 + b^3$

Using sum of cubes:

$a^3 + b^3 = (a + b)(a^2 - ab + b^2)$

So:

$x^3y^6 + 27z^{42} = (a + b)(a^2 - ab + b^2)$

Substitute in, values of a and b

$x^3y^6 + 27z^{42} = (xy^2 + 3z^{14})((xy^2)^2 - (xy^2)*(3z^{14}) + (3z^{14})^2)$

$x^3y^6 + 27z^{42} = (xy^2 + 3z^{14})(x^2y^4 - 3xy^2z^{14} + 9z^{28})$

5 0

3 years ago

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The mean of three numbers is 12 . Two of three numbers are 9 and 14 . What is the third numbers ?

Olenka [21]

13 is the correct answer

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4 years ago

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Mr. Green drove 100 miles in 2 hours. He continues to drive at this same speed.

Helga [31]

Answer:

4 hours.

Step-by-step explanation:

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3 years ago

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