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3 years ago

Help me please i will mark who ever the brainly thing .

Mathematics

2 answers:

vodomira [7]3 years ago

6 0

Answer:

y=54°

Step-by-step explanation:

Since they are parallel we can make a equation, instead of having to work with two variables we can work with one, y is on the same side as (½x+20)°, they would equal the same amount.

So here is our equation

(2x-10)+(½x+20)°=180°

we get the 180° because it is a straight angle.

Now we can solve

(2x-10)+(½x+20)°=180°

2½x+10=180°

-10 -10

2½x=170°

÷2½ ÷2½x

x=68°

Since we said y = (½x+20) and x is 68, we can solve for y

half of 68 is 34+20=54°

y=54°

ddd [48]3 years ago

4 0

Answer:B *54 degrees*

Step-by-step explanation:

2x-10 + 1/2x + 20 = 180

add up like terms

2.5x + 10 = 180

subtract 10 from both sides

2.5x = 170

divide by 2.5 on both sides

x = 68

now plug in x to the (2x-10) expression [which will get you 126 degrees]

then subtract 180 - 126 to fine angle y. which should get you *54 degrees*

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4 years ago

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miss Akunina [59]

Answer:

D. 2(√{x} + √{x - 2})

Step-by-step explanation:

As hinted in the question, we have to simplify the denominator.

To understand it easier, let's imagine we have x - y in the denominator. If we multiply it with x + y we'll get x² - y², right? Check the next line:

(x - y) (x + y) = x² + xy -xy - y² = x² - y²

If we have the square of those nasty square roots, it will be much simpler to deal with. So, let's multiply the initial fraction using x+y, but with the real values:

$\frac{4}{\sqrt{x} - \sqrt{x - 2} } * \frac{\sqrt{x} + \sqrt{x - 2}}{\sqrt{x} - \sqrt{x - 2}} = \frac{4(\sqrt{x} + \sqrt{x - 2})}{(\sqrt{x} )^{2} - (\sqrt{x - 2} )^{2} }$

Then we simplify:

$\frac{4(\sqrt{x} + \sqrt{x - 2})}{(\sqrt{x} )^{2} - (\sqrt{x - 2} )^{2} } = \frac{4(\sqrt{x} + \sqrt{x - 2})}{(x) - (x - 2) } = \frac{4(\sqrt{x} + \sqrt{x - 2})}{ 2 } = 2(\sqrt{x} + \sqrt{x - 2})$

Answer is D. 2(√{x} + √{x - 2})

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3 years ago

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Step-by-step explanation:

???

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Step-by-step explanation:

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3 years ago

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san4es73 [151]

Answer:

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Step-by-step explanation:

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