Homework Help Forum: 11th grade

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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