Posted by Cecilia on Saturday, September 12, 2009 at 12:20pm.
I had a quiz in math.
The problem is:
4.3+(7.2)
I got the answer 11.5 and my teachr marked it wrong. When she gave us a chance to fix the errors for half credit, I tried it again. But I KEEP getting the same answer. What am I doing wrong?

Algebra 1  bobpursley, Saturday, September 12, 2009 at 12:24pm
abs( 4.3+(7.2))
abs(4.37.2)
abs(2.9)
2.9 
Algebra 1  muffy, Saturday, September 12, 2009 at 12:25pm
You have to solve the absolute value first, then change the sign to the opposite.
So, it is 4.3 + 7.2 = 2.9
Then take the absolute value of 2.9
which is 2.9 
Algebra 1  bobpursley, Saturday, September 12, 2009 at 12:27pm
good work, Muffy.

Algebra 1  Cecilia, Saturday, September 12, 2009 at 12:28pm
Oh!! You don't do the absolute value part until the end!! I get it now! I was changing it at the beginning!! THank you soo much!

Algebra 1  Cecilia, Saturday, September 12, 2009 at 12:30pm
Like.... You solve it and then change it to the opposite. It's hard to explain now, but Igot it! Thank you guys so much! You're life savers!

Algebra 1  muffy, Saturday, September 12, 2009 at 12:38pm
Thanks, getting something right gives me great confidence!