All Answers 358179 Answers

-2y - 4.2 = 1.8 + 3y

This one is pretty easy. First, multiply through by ten to get rid of the decimals:

-20y - 42 = 18 + 30y

Isolate your variables:

-42 = 18 + 50y

-60 = 50y

Divide both sides by 50.

$${\mathtt{\,-\,}}{\frac{{\mathtt{60}}}{{\mathtt{50}}}}$$ = y

Simplify (cancel out 10's)

$${\mathtt{\,-\,}}{\frac{{\mathtt{6}}}{{\mathtt{5}}}}$$ = y

Then write it in correct notation:

{y: y = $${\mathtt{\,-\,}}{\frac{{\mathtt{6}}}{{\mathtt{5}}}}$$}

The solution to an equation is given in brackets, generally. So, if you're solving for x, the solution in proper notation should be {x : x = 4} (or whatever number). If you're solving a two-variable system, the solution could be {(x, y): (2, 6)}.

To answer your question, since the solution is always put in brackets {--}, {} means that there is no solution. This is called the "empty set" (because the answer to a problem is known as its solution set, and in this case, there are no values in the statement). Please see attached image for an alternative way to write no solution.

We can try to factor, first.....if no factorization is possible, we might try to use the "Rational Roots" theorem to see if there are any real "zeros" that would reduce this to a quadratic - which can then be "solved."

Barring that, there is a general "formula," but it's pretty "sticky."....I won't attempt to write it out, but if you're interested, it's presented here......

Of course....using a graphing program like Desmos is always a good option, too!!!

In a fraction? It can't be simplified any more than $${\frac{{\mathtt{23}}}{{\mathtt{100}}}}$$.

In a decimal? The only way to write it is 0.23.

When your putting a fraction into a calculator you use this / to do the fraction.Ex:7/11

10.7592625669

There is no simple answer to this.  Do you have a specific non-linear equation you wish to solve?

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Press the 2nd button and use acos  (or hold the cursor on cos for a few seconds).

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In the following the Greek letter, μ, stands for the mean and σ stands for the standard deviation. x_k stands for the k'th score.

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I was showing how I solve the question.I really learned a lot skills from you all.

Like Melody did

$${\mathtt{0}} = {\frac{{\mathtt{SinA}}}{{\mathtt{a}}}}{\mathtt{\,\times\,}}\left[\left({\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{b}}{\mathtt{\,\small\textbf+\,}}{\mathtt{c}}\right){\mathtt{\,\times\,}}{\mathtt{b}}{\mathtt{\,\small\textbf+\,}}\left({\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{c}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b}}\right){\mathtt{\,\times\,}}{\mathtt{c}}{\mathtt{\,-\,}}{\mathtt{2}}{\mathtt{\,\times\,}}{{\mathtt{a}}}^{{\mathtt{2}}}\right]$$,and sinA and a can be 0.

then you get 0=（2b+c)*b+(2c+b)*c-2a^2

i realized that 0 divede any number except 0 equal to 0.

This skills really helpful for me to solve the similar questions in my practices.

i post my  question on the forum because i dont really know how to solve the questions in sometimes.

sometimes,i just believe that the question is impossible to find out the soloution,but you guys can.That is amazing.But is sometimes, i get the anwsers ,but I am not sure.So i post it in this forum to check my anwser.

Anyway,this website is very helpful for me!Thanks all!

s = 45 km    

t = 1 h, 15 min = 1.25 h (since 15 min = .25 h)

 v = s/t = 45 km/1.25 h = 36 km/h

f(x) is basically Y. On a graph, f(x)=31 is a horizontal line passing through 31 on the Y axis. Since there is no way to find X with this equation, X=All Real Numbers and the slope is zero.

der 21 21 22 1 21 21 21 21

The formula for the area is: A = pi * r²

Where r is the radius, and pi i the mathematical constant ≈ 3.14

And for the circumference: C = 2 * pi * r      =>      r = C/(2 * pi)

We combine the two formulas: A = pi * r² = pi * [ C/(2 * pi) ]² = pi * ( C²/4pi² )

A = C²pi/4pi²

A = C²/4pi

Now you just fill in for C = 45 m and pi ≈ 3.14 

 21 21 21 21 21 2121

Rosala is incorrect, it's obviously 21.

The answer is 21.

Don't listen to him, it is obviously 21!

21

😘Hehehehe

19, definitely not 21

that vine was funny for about 10 minutes 3 years ago

the answer is 15.

it means what is 25 +    =75

sevendy five equals blank plus twinty five

the answer is 19