Which expression represents, twice the difference of two numbers?

2−x−y2−x−y

2(x+y)2(x+y)

2x−y2x−y

2(x−y)

Question

Which expression represents, twice the difference of two numbers?

2−x−y2−x−y

2(x+y)2(x+y)

2x−y2x−y

2(x−y)

benji · Answer

Twice the difference between two numbers. So we need to find the difference first, then multiply that number by 2. So 2(x-y)

shaima · Answer

im still confused

benji · Answer

Ok well "difference" is what we hear when we subtract two numbers. The difference between 9 and 4 is 9-4 so 5.

shaima · Answer

ohh

benji · Answer

So what is the difference between 6 and 8?

shaima · Answer

2? i think?

benji · Answer

A better way to describe difference is if you put the two numbers on a number line how many spaces are in between? You were right with 2. And if we say what is the difference bwtween -5 and 10, its not just 10-(-5) we have to think -5 is 5 spaces away from 0 and then 10 spaces to 10 so 15 is the difference.

shaima · Answer

can u help me with one more?

benji · Answer

and then saying twice something is just multiplying it by 2

benji · Answer

sure

shaima · Answer

On Monday, Jason ran x miles. On Tuesday, he ran 5 fewer miles than on Monday.

Which expression represents the total number of miles Jason ran over these two days?

−5x-5x

x−5x-5

2x−52x-5

2(x−5)

benji · Answer

Well tha$$2x-5$$t is first day x and then next day x-5 so$$x+x-5$$or

benji · Answer

messed up a little bit haha 2x-5 should be at the end

shaima · Answer

Thanks

benji · Answer

yep