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a+a+2b=2a+2b

It is the process by which a life ceases to be.

You are welcome.  I am glad that someone here could help you:))

3*10^(8-1)=3*10^7

The translation from Persian is not working properly. It does not make sense. This may be because you are not spelling things properly or perhaps you are using incorrect grammar.

ترجمه از فارسی است کار را نمی کند.
این معنی ندارد.
این ممکن است به دلیل این که شما همه چیز تلفظ نمی کند و یا شاید شما با استفاده از دستور زبان نادرست است.

Choose any number that you want for b ... any number will work ... and then determine the others ...

Theanswer is 98.2

Here are some websites with practice questions

Nice, saseflower.....

I should mention that this works with multiplication, too....but not  (generally) with subtraction or division

For instance   4 x 8  = 8 x 4

But  4 - 3 ≠ 3 - 4

And 8 / 4  ≠  4 / 8    !!!

Using A = P(1 + r/n)^(n*t)    where

A =  the amount acumulated

P  = the principal = 2000

r = the interest rate = .05

n = the compounding periods per year  = 2

t= the number of years  = 2

So we  have

A = 2000(1 + .05/2)^(2 * 2)   = 2000(1 + .025)^4 = $2207.63

The commutative property allows you to swap numbers around and still get the same answer.

Ex:

2 + 1 = 1 + 2

Yeah....after looking at this one again, I have to agree with your answer of 16.5...

50 lashes with a wet noodle, for me !!!

My teacher is having us memorize 1-25 squared, and basically you just have to study!

Yes this is a fabulous calc for many purposes but for graphing most of us use Desmos.  :))

For some angles ther is but not for 23 degrees

To be absolutely honest, a lot of people don't use certain types of math when they are older, like algebra. But we do need math to get to good colleges, it's just the way things are. When you say "why do we need math" that also means why do we need to know 1 + 1? You use math in every day life.

$$\\ \frac{4}{(x+3)} - \frac{2}{(x+1)^3} + \frac{2}{(x+1)^2} + \frac{5}{(x+1)}\;\; turn \;into\;\frac{ 4}{(x+3)} + \frac{(2x)}{(x+1)^3} + \frac{5}{(x+1)}\\\\
Mmm\\
\frac{4}{(x+3)} - \frac{2}{(x+1)^3} + \frac{2}{(x+1)^2} + \frac{5}{(x+1)}\\\\
=\frac{4}{(x+3)} + \frac{-2}{(x+1)^3} + \frac{2(x+1)}{(x+1)^3} + \frac{5}{(x+1)}\\\\
=\frac{4}{(x+3)} + \frac{-2+2x+2}{(x+1)^3} + \frac{5}{(x+1)}\\\\
=\frac{4}{(x+3)} + \frac{2x}{(x+1)^3} + \frac{5}{(x+1)}\\\\$$

3x - 4 = 107

Add 4 on both sides

3x = 110

Divide by 3 on both sides

x = 36.6666666667 or 36.7 or 37

x+3/10=2/5                                    1+3/10=2/5

*10     *10                                     4/10=2/5

x+3=4                                           2/5=2/5

-3    -3

x=1

x+3/10=2                                    17+3/10=2

*10     *10                                     20/10=2

x+3=20                                           2=2

-3    -3

x=17

uhhhh..... interesting.....

It said minimum total length

that is why I used 17.5cm

I thought that was what the question was getting at :)

The way i do it is I multiply everything by 10 to get rid of the denominators, so (x + 3/10) * 10 and (2/5)*10.  That gets you 10x + 3 = 4.  subtract 3 from both sides to isolate x so 10x = 1.  Divide both sides by 10 so 10x/10 = 1/10.  That leaves you with x = 0.1 if you simplify 1/10.  Plug it back in to check.  0.1 + 3/10 = 2/5.  2/5 = 0.4 if you simplify.  3/10 = 0.3 if you simplify.  0.1 +0.3 = 0.4.  0.1 + 0.3 Does add up to 0.4, so x = 0.1.

How about 3.14159265 35897932384626433832795028841971693993751 to be exact. 

We have

tan (46) = 90 / d     where d is the distance the boat is from the cliff   ....  rearrange...

d = 90/tan(46) = 86.9m