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Inequality is a kind of equation, but where the equal sign is replaced by <, >, \(\geqslant\), and \(\leqslant\). 

Wot!?

So those are guests??

I thought that was an error!!

I know that!! But I am so careless......

If we substitute x = 3 into the original equation, we get sqrt(64) = 3 - 11 = -8. Since sqrt(64) = 8 not -8, so I should reject the solution x=3.

x-(sin(2x))/2=1.1

\(x-(sin(2x))/2=1.1\\ x-\frac{ 2\sin(x)\cdot\cos(x)}{2} =1.1 \\ x-\sin(x)\cdot\cos(x) =1.1 \\\)

x-(sin(2x))/2=1.1

Using Newton-Raphson method of successive approx., we get:

x ≈ 1.33084574921....(in radians).

There are some problems with this site:

1. Some of my answers are getting deleted for no reason (they didnt contain mature content)

2. Sometimes the sign that means there is a new answer appears, although there is no new answer.

Probably because other posts and answers are getting for me.

3. Im not getting any mails from this site

4. You keep marking my questions with that sign that wont allow normal users to see the answer. Im a normal user, AND I CANT SEE THE ANSWER TO MY FUDGING QUESTION.

No dont do it this website is s**t they going to track you down and eat your soul

I already answered your question why cant i see my answer?

|2x +4| = 8       Technique is to always square both sides and solve the quadratic

(2x+4)^2 = 64

4x^2 +16x +16 = 64          divide through by  4

x^2 +4x +4 =16

x^2 +4x - 12= 0

(x+6)(x-2) = 0    so x = -6  and x = 2

2|x| +4 =8    rearrange to get the modulus expression on its own,and,again,square both sides

2|x| = 4     so |x| =2      so x^2 =4     so x= plus or minus 2

Exactly the same method for the last one.Have a try yourself.

Linear dimensions (such as perimeter) scale as the square root of area, so;

perimeter ratio = (72/50)^1/2 → 6/5

.

Take logs of both sides:

ln(1.25) = ln(1.04^x)    

Use the following property of logs:  ln(a^b) = b*ln(a) to get:

ln(1.25) = x*ln(1.04)

Divide both sides by ln(1.04)

x = ln(1.25)/ln(1.04) ≈ 5.689

.

How's this off-topic?

1. USE THE B****Y CALCULATOR THAT'S ON THE HOME PAGE

9+10

Answer

19

Assuming you mean square root and that you are talking about the calculator on the home page.

1 + 1 x 1 / 1 = a

a = 1 + 1 / 1

a = 1 + 1

a = 2

x = ~5.6

just by guess and check... if you want a better answer use mathpapa.com

A problems is being discussed here.

Let

\(a \equiv 1 \pmod{4}\).

Find the value of

\(6a + 5 \pmod{4}\)

Express your answer as a residue between 0 and the modulus.

\(\begin{array}{|rcll|} \hline && 6a + 5 \pmod{4} \\ &\equiv& 6a + 5 -4 \pmod{4} \\ &\equiv& 6a + 1 \pmod{4} \quad & | \quad a \equiv 1 \pmod{4} \\ &\equiv& 6\cdot 1 + 1 \pmod{4} \\ &\equiv& 7 -1\cdot 4 \pmod{4} \\ &\equiv& 7 -4 \pmod{4} \\ &\equiv& 3 \pmod{4} \\ \hline \end{array}\)

The answer is 3.

Adding to what Melody said:

Radians are a measure of the arc length. Cosine is a measure of horizontal distance that an angle produces in a circle with radius = 1.

Why is acos(1.5) an error? Isn't that just asking how many radians it takes to reach 1.5 degrees around a circle?

No it is not asking changing radians to degrees

acos is the same as inverse cos.

It is saying  if    \(cos\theta =1.5 \text{ then what is }\theta\)

Well the cos of any angle must be between -1 and +1

1.5 is outside this range so the question does not make sense.

If you want to know how many radians in 1.5 degrees then think of it like this

\(360^\circ=2\pi ^c \\ 180^\circ=\pi ^c \\ 1^\circ=(\frac{\pi}{180})^c\\ 1.5^\circ=(\frac{1.5*\pi}{180})^c\\ 1.5\;degrees=\frac{\pi}{120}\;radians\\ \)

\(\frac{1\text{ mile}}{0.5\text{ hours}}=\frac{2\text{ miles}}{1\text{ hour}}\times\frac{1,60934km}{mile}=3.21868km/hour\)

  !

1+1*1/1 = 2

The admin has been making some updates to the site recently. All these issues should be ironed out before long.

You can post bugs/errors that you come across in this thread:

I don't really know what the question is, but I'm guessing that you want this speed expressed in miles per hour.

\(\frac{1\text{ mile}}{0.5\text{ hours}}=\frac{1/0.5\text{ miles}}{0.5/0.5\text{ hours}}=\frac{2\text{ miles}}{1\text{ hour}}\)

That speed is 2 miles per hour.

\(14\frac{3}{7}-9\frac{4}{5} \\=(14+\frac{3}{7})-(9+\frac{4}{5}) \\=14+\frac{3}{7}-9-\frac{4}{5} \\=5+\frac{3}{7}-\frac{4}{5} \\=5+\frac{15}{35}-\frac{28}{35} \\=5-\frac{13}{35} \\=4\frac{22}{35}\)