Dms

0 Questions
32 Answers

+64

0

geofjen@gmail.com:
in the following expression: x-(21*x\100)=275000 how does that become x=27500000\79?

Hello, lets start:
x-(21x/100) = 275000 => Now we just subtract x from the fraction 21x/100. Here's how: http://www.mathsisfun.com/fractions_subtraction.html
And we got =>
[list]

(100x-21x)/100 = 275000 => 79x/100 = 275000 =>[/*:m][/list:u]
Now we multiply with 100 from both sides:
[list]

=> 100 * (79x/100) = 100 * 275000 => 79x=27500000[/*:m][/list:u]
Then, we divide with 79 from both sides:
[list]

=> 79x/79 = 27500000/79 => x = 27500000/79[/*:m][/list:u]

If you need more help, you can reply here

Dms

Dms22 Mar 2014

+64

0

Remeber that: (a-b) ² = a ²-2ab+b ²
So you have:
(w-13)(w-13)=16 =>
(w-13) ²=16 =>
w ²-2w*13+13 ²=16 =>
w ²-26w+153=0 =>

Check, Quadratic equation: http://en.wikipedia.org/wiki/Quadratic_equation

w=(26+sqrt(26^2-4*153))/2

OR

w=(26-sqrt(26^2-4*153))/2

So there are 2 solutions!
w=9 OR w=17

Dms

Dms19 Mar 2014

+64

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Hey, 10/21 = 10 : 21. So it's A.

Dms

Dms17 Mar 2014

+64

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juicybebe101:
yes if u plug it into a calculator thats what you will obtain however math_lover101 is asking for the exact exponent as previously stated

e^(ln(6))
So, the only solutions are: 3^(ln(2)) AND 2^(ln(3))

Dms

Dms15 Mar 2014

+64

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juicybebe101:
its 6 you multiply the two powers

Hello! The answer "6" is wrong. This could be 6 if it was e^((ln(3)+ln(2)).
You can write e^((ln(3)*ln(2)) as:

2^(ln(3))

So, the final result is: 2.1414860639032773

Dms

Dms14 Mar 2014

+64

0

Hello Lt_Soul,
We are searching a line e: y=mx+b.
If e(line) parallel to y=2x+5 then the two lines have the same Slope! So m=2.
Also, if the point A(-7, -9) we can easy find b:
(y-y_A)=m(x-x_A) => (y-(-9))=2*(x-(-7))

(y-(-9))=2*(x-(-7))

Finally, the line which is parallel to y=2x+5 and passes through the point (-7, -9) is the line y=2x+5

Dms

Dms14 Mar 2014

+64

0

Hey, check this calculator: http://web2.0calc.com/

Dms14 Mar 2014

+64

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Hello XxjenniluvzxX, 2.1875 is equal to 35/16:

35/16

This is #40BFBF, use it as [color=#40BFBF]TEXT_HERE[ /color]
This is #40FF00 [color=#40FF00]TEXT_HERE[ /color]

Dms

Dms12 Mar 2014

+64

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This site has a great online calculator! Please check it for your next calculations: http://web2.0calc.com/

Dms12 Mar 2014

+64

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Hello denise! Percentage Calculators: http://www.math.com/students/calculators/source/3percent.htm
So, 60% of 70.000 = 42000

Dms

Dms11 Mar 2014

+64

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Hello! Try to use Google: http://lmgtfy.com/?q=10+feet+to+inches
You'll get: 10 feet= 120 inches

Dms

Dms11 Mar 2014

+64

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If a=-4.2 then -a=4.2
How? a=-4.2 => (-1)*a=(-1)*(-4.2) => -a=4.2

Dms

Dms10 Mar 2014