Posted by **brooke** on Thursday, September 24, 2009 at 8:35pm.

can you please evaluate these expressions if x=5 y=3.5 and w= -3

1.|2x-15|

2.|-2y=8|-9

3.|w-x|-|10y-w|

- Math, not "11th grade" -
**Writeacher**, Thursday, September 24, 2009 at 8:39pm
Assistance needed.

Please type your __subject__ in the **School Subject** box. Any other words are likely to delay responses from a teacher who knows that subject well.

- 11th grade -
**Christiaan**, Thursday, September 24, 2009 at 8:47pm
The | | signs mean "absolute value". When you take the absolute value of a number, you always take the numbers positive value. So |-5| = 5, |-21| = 21, |24| = 24, |5| = 5, and so on.

So, for the first expression, if we replace the x with 5, we get that:

|2*x-15| = |(2*5)-15| = |10-15| = |-5| = 5

There seems to be an error in your second expression, because there can't be any equals signs inside the || signs.

For the third expression we get that:

|w-x|-|10y-w| =

|-3-5| - |(10*3.5)-(-3)| =

|-8| - | 35 + 3| =

8 - 38 = -30

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