Forgo

Like @NoWorkNeeded said, if he missed both times we multiply 0.4 by 0.4 to get 0.16.

As a fraction, this is 4/25

Ok, 

We apply the rule where a/b = c/d is ad = bc. 

3 . 2x = x+10 . 1

6x = x+10

We isolate 6x by subtracting x from both sides.

5x = 10

x = 2

Sure!

To make a fraction, we want the denominator to be as small as possible and the numerator as large as possible. We need to make x the smallest value that satisifies the inequality. We will use 1 because we don't want our denominator to negative because then the decimal form will be negative. The largest value of y that satisfies the conditions is 4. 4 + 1/1 = ?

You do that yourself

Hats of to you!

\(\sqrt{4-2}\sqrt{3} \)

 = \(\sqrt{3}+1\)

\(\sqrt{7-4\sqrt{3}}=2-\sqrt{3}\)

We cancel out \(\sqrt{3}\) to get -1 + 2.

For humor, you do -1 + 2 yourself!

This is an AoPs question.

Your username is huangtx2018

(edited)

Well actually I don't post AoPs questions. The reason I thought you go to AoPs is b/c you have the same profile picture as some one in an AoPs class I'm taking. You can check my profile. I've never asked a question on this site. I have only answered

The sum of the degrees in any triangle is 180 degrees

(x+10)+(3x-5)+x=180

5x+(10-5) = 180

5x+5=180

5x = 175

x=35

The angles in all quadrilaterals sum up to 360.

We do a little algebra to find x.

108 + 108 + 2x + x = 360

216 + 3x = 360

3x = 144

x = 48

Therefore my final answer for the value of x is 48