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(4.3-7.2)

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!

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