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2x-5y=-3   add 5y, 3 to both sides and rewrite this as

5y  = 2x + 3      divide both sides by 5

y = (2/5)x + (3/5)     and the slope is the thing in front of "x".....in this case, (2/5)

(3.2*10^4) / (6.8*10^3)   we have

(3.2 / 6.8)  * (10^4 / 10^3)  =

0.4705882352941176 * 10¹ =

4.705882352941176 * 10⁰     [approx. ]

31536000000000000000000000

To: CPHILL: What does this mean? The rule doesn't appear to be carved in stone, despite the claim of some ignorant people:

"A common technique for remembering the order of operations is the abbreviation "PEMDAS", which is turned into the phrase "Please Excuse My Dear Aunt Sally". It stands for "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction".

The Order of Operations: PEMDAS - Purplemath

A common technique for remembering the order of operations is the abbreviation "PEMDAS", which is turned into the phrase "Please Excuse My Dear Aunt Sally". It stands for "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction".

The Order of Operations: PEMDAS - Purplemath

21.3moles of barium:

What do you want calcuated in 21.3 moles of Barium?

If you want the number of atoms, molecules, ions, or electrons, then it's:

21.3 X 6.0221413 X 10^23=1.2827160969 X 10^25 atoms, molecules.......etc.

Go ahead and post a specific problem......

Hey, Dragonlance....good research on F 451 ....!!!

It's a good book......kind of like "1984" by George Orwell.......

[I'm a big fan of Sherlock Holmes, too....!!!]

I just found out that 451 Fahrenheit is the temperature when paper starts to burn. I probably read that one soon. I read some of the Sherlock Holmes adventures. I like  "The Adventure of the Engineer's Thumb" and  "A Case of Identity" the most.

Last year 7UP tell me about "The Grapes of Wrath" when he was reading it. He say what ever you do don’t drink too much wine while reading it because you will find out the hard way about "The Wrath of Grapes".  It take me awhile to figure out his joke. I still laughing.  hahahaha

150,000,000 km =

1.5 x 10⁸ km

DragonLance I got mystery!  :D

And CPhill I reserved The grapes of Wrath from my local library :)

Thanks both of you ! :)

1*10^-14/4.2*10^-6  =

[1/4.2]  * 10^-14 / 10^-6 =

0.2380952380952381 * 10^6 / 10^14  =

0.2380952380952381 * 10^-8  =

2.380952380952381 * 10^-9  [ approx.]

76(5+9)-981+2500(9)   adding inside the parentheses first we have

76(14) - 981 + 2500(9)   next, we perform any mutiplications before additions/subtractions

1064  - 981 + 22500   now, we just perform any additions/subtractions as we encounter them from left to right.....so we have

1064 - 981 + 22500 =  22583

There are 3 significant figures in 40,500 mg...

I misread the number and give a wrong answer.

It should be this

1 + 5/20 + 3+ 8/20

 4+13/20

The common denominator is 20.....so we have

8/20 + 15/20  =  23/20

Remember that the arctangent returns an angle from ( -90 , 90 )

In this case the angle is  -26.6°....so  we would actually add this to 360° to get the correct positive angle of  333.4°

2^100  = 1,267,650,600,228,229,401,496,703,205,376

[ approximately, 1.267 nontillion.!!!!  ]

-2(6+x)<-16+2x     simplify the left side

-12 - 2x  < -16 + 2x        add 16 , 2x to both sides

4 < 4x      divide both sides by 4

1 < x      or, put another way,    x > 1

Fahrenheit 451 - Ray Bradbury

The Grapes of Wrath - John Steinbeck

The Count of Monte Cristo - Alexandre Dumas

The Adventures of Sherlock Holmes - Sir Arthur Conan Doyle

These should get you started......[ I highly recommend the second one.....my favorite book of all time....!!!]

Hi MathsGod

Go here.

Brackets

Indices

Division

Multiplication

Addition

Subtraction

Change the denominators to same base number.

1 + 5/20 + 3+ 12/20

= 4 + 17/20

Thank You CPhill. :)