All Answers 356066 Answers

First question:

9x - 9y = -99x - 9y = -9

That implies: x - y = -11x - y = -1

x - y = -11x - y

x = -11x

1 = -11

That means you can't divide by x because you get a strange result..... That means x = 0.

0 - y = -1, y = 1.

Therefore \(x = 0, y= 1\)

Second question:

-8x + 9y = 11 - 8x + 9y = 11

Only know that you cannot subtract a number which is not 0 and then get the same results...... 

Therefore no solution.

\(\dfrac{4}{5}-\dfrac{3}{4}\\ =\dfrac{16}{20}-\dfrac{15}{20}\\ =\dfrac{16-15}{20}\\ =\dfrac{1}{20}\)

1. Inscribed Angle Theorem

2. m(arc)DAB=2(mC)

3. The sum of the arcs that make a circle is 360dg, 

4. mA+mC=180dg

In Hong Kong we just do "opp.(opposite) angles of cyclic quadrilateral" and then write mA + mC = 180. All finished. :)

|x+1|>-3/2

The absolute value of any expression must always be greater or equal to zero.

Since it must be greater or equal to zero it MUST also be greater than any negative number.

Hence  x can be any real number.

\(3\div (-1/4)\\ = 3\times (-4)\\ =-12\)

1st term is 1/3 = \(\dfrac{1}{3^1}\)

2nd term is 1/9 = \(\dfrac{1}{3^2}\)

3rd term is 1/27 = \(\dfrac{1}{3^3}\)

Therefore general formula is \(a_n = 3^{-n}\)

Know that 60% of 9.168 is 5.5008

Multiply by a trillion:

Therefore 60% of 9.168 trillion is 5.5008 trillion, which is 5 trillion, 500 billion, 800 million. :)

24/2 = 12 :)

You have 2 dozen(24) of eggs and half of then is a dozen(12) of eggs.

|x + 1| must be larger than -3/2

Therefore there are infinitely many solutions of x.

-2.

add 5 -> 3

multiply by 7 -> 21

-2.

add (5 multiply by 7) -> -2 add 35 -> 33

Thanks for the suggestion.

What order of operations?

If you were saying -2, adding [5 multiplied by 7], then the answer is 33. If you were saying -2, adding 5, then multiplying by 7, the answer is 21.

I have tried to post an answer but the site froze up and I lost it all.

Here is the short version

solve tan 2x = - cot (x + pi/3)

I solved by graphing.

Herer is the full graph

You need a graphical or numerical method to find the value of x here.

It's a good idea to draw a graph anyway to get a good initial estimate for an iterative numerical method:

So x ≈ -0.204

.

Umm...

Overflow.

190674⁹⁷ = Error: overflow

Or:

190674^1/97 = 1.1335377674334057

Assume the currency is $ (dollars):

The sale price = $256

Discounted price = $256 * (100-25)% = $192

Discounted price + tax = $192 * (100+15)% = $220.80

First Question

9x - 9y = -99x - 9y = -9

9x - 9y = -99x - 9y = -9 (cancel -9y)

9x        = -99x        = -9 | ÷ -9

-x         = 11x         = 1  | + x

0          = 12x        = 1+x

If 12x = 0, then x = 0 but 1+x = 1+0 = 1 so 0 = 0 = 1 is not true. Hence there are no solutions

Second Question

(-8x + 9y) = 11 + (- 8x + 9y) = 11                | -(- 8x + 9y) on all sides

0 = 11 + 0 = 11

0 = 11 = 11

0 ≠ 11

No solutions

The easiest explanation i could tell you is that the goal is to get a all variables on one size of the =. I would suggest watching some youtube videos on this because some people learn by watching instead of reading. This is a good example of one that can prepare you for any future equations. 

https://www.youtube.com/watch?v=wShnYemIr28

Times the length of the square and √2.

L*√2=diagonal

62/50 = 124/100 (twice numerator and denominator)

x/100 = x %

If x = 124

x/100 = x % substitute x with 124

124/100 = 124%

62/50 = 124%

3 e^x + 12x = 0         | - 12x

3 e^x = -12x              | ÷ 3

e^x = -4x                   | ÷ -4

-(e^x/4) = x

x = -(e^x/4)