3 years ago

Please help in maths

Mathematics

1 answer:

34kurt3 years ago

8 0

Answer:

$(3d^{4})^{2} = 9d^{8}$

option B is correct

Step-by-step explanation:

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Write the equation of a line perpendicular to 9xplus7yequals6 that passes through the point (9,negative 7).

andrew11 [14]

$k:\ y=m_1x+b_1\\\\l:\ y=m_2x+b_2\\\\k\ ||\ l\iff m_1=m_2\\\\k\ \perp\ l\iff m_1m_2=-1$

We have:

$k:\ 9x+7y=6\ \ \ |-9x\\\\7y=-9x+6\ \ \ \ |:7\\\\y=-\dfrac{9}{7}x+\dfrac{6}{9}\to m_1=-\dfrac{9}{7}\\\\l:\ y=m_2x+b\\\\l\ \perp\ k\iff-\dfrac{9}{7}m_2=-1\ \ \ \ |\cdot\left(-\dfrac{7}{9}\right)\\\\m_2=\dfrac{7}{9}\to\ l:\ y=\dfrac{7}{9}x+b$

We know. The line l passes throught the point (9, -7). Substitute the coordinates of the poin to the equation of line l :

$-7=\dfrac{7}{9}\cdot9+b\\\\-7=7+b\ \ \ \ |-7\\\\b=-14$

$y=\dfrac{7}{9}x-14\ \ \ \ |\cdot9\\\\9y=7x-126\ \ \ \ |-9y\ |+126\\\\7x-9y=126$

Answer: $y=\dfrac{7}{9}x-14\to7x-9y=126$

7 0

3 years ago

The farmer wants ratio horses : cows to equal 5 : 3.

weqwewe [10]

Answer

He needs to buy 27 Cows

Step-by-step explanation:

if the ratio from horses to cows is 5-3 then you multiply 5 by the number to get 45 and also multiply it by 3

5 x 9 = 45

3 x 9 = 27

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2 years ago

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Identify the irrational sum(s). Select all that apply. (My second and last question!)

SashulF [63]

I believe is A :)
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3 years ago

One half a number yes more. than 22

weqwewe [10]

what? um child.... anyways

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3 years ago

What are the solutions to the equation? x2 + 6x = 40

Bumek [7]

X=5 because 2x plus 6x equals 8x and then when you divide the 40 by 8 u get 5

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3 years ago

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