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Otrada [13]
3 years ago
15

Please explain to me how 3.2÷4=0.8 is done

Mathematics
2 answers:
DedPeter [7]3 years ago
4 0

To make it easier just assume there is no decimal point then just work out the 32÷4 where we know that 4 goes into 32 8 times so you get 8 remember the decimal point and since it was one decimal place you will push the decimal over to the left of 8 and that is how you get 0.8

trapecia [35]3 years ago
4 0

So the idea with literal equations is to get one variable in terms of all the rest.  In this equation, we are trying to solve for x in terms of y (meaning that we are trying to get x all by itself with y on the other side of the equal sign).  Whenever you have a single fraction by itself on one side of an equal sign, the first thing that I always do is cross multiply.  This gets rid of the fraction completely and makes everything look a little nicer:

y * (5-4x) = 1 * (2x+3)

Distribute on the left side:

5y-4xy = 2x+3

Move the x's all to the same side.  I'm doing this by subtracting 2x from both sides:

5y-4xy - 2x = 3

For simplicity's sake, move 5y to the right side of the equation by subtracting it from both sides:

-4xy - 2x = 3 - 5y

Factor out the x on the left side:

x (-4y-2) = 3 - 5y

Get the x term by itself on the left side by dividing both sides by -4y-2.

x = (3-5y)/(-4y-2)

 

And there you have it!  I hope that this helped a little.  Good luck!

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3 years ago
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Answer:

I found two different solutions. Hope one of them help!

1. x = -1/3 = -0.333

2. x = 5/2 = 2.500

Step-by-step explanation:

13 ± √ 289

  x  =    ——————

                     12

Can  √ 289 be simplified ?

Yes!   The prime factorization of  289   is

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To be able to remove something from under the radical, there have to be  2  instances of it (because we are taking a square i.e. second root).

√ 289   =  √ 17•17   =

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So now we are looking at:

          x  =  ( 13 ± 17) / 12

Two real solutions:

x =(13+√289)/12=(13+17)/12= 2.500

or

x =(13-√289)/12=(13-17)/12= -0.333

Two solutions were found :

x = -1/3 = -0.333

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