my lil brother was given a math problem for homework as follows
5^2 - (40/4)/2 = ?
my bro answered 7.5 and the teach says its 20...who is right?
5^2 - (40/4)/2 = ?
my bro answered 7.5 and the teach says its 20...who is right?
math homework ?
- Thread starter ridetoofast
- Start date
why don't you explain or have your little brother explain how he came up with 7.5?
5^2 - (40/4)/2 , substitute 25 for 5^2 (which is 5 * 5 of course)
==> 25 - (40/4)/2, now substitute 10 for 40/4
==> 25 - 10/2, now remember that division takes precedence over subtraction so substitute 5 for 10/2
==> 25 - 5
== 20.
5^2 - (40/4)/2 , substitute 25 for 5^2 (which is 5 * 5 of course)
==> 25 - (40/4)/2, now substitute 10 for 40/4
==> 25 - 10/2, now remember that division takes precedence over subtraction so substitute 5 for 10/2
==> 25 - 5
== 20.
It's 20.
DAMN YOU TOSHI!!!!
I wanted to be the one who looked smart!
I wanted to be the one who looked smart!
its been a while since ive had to do any al gee brah and couldnt remember
the heiarchy of operations with relation to paren's...
he thought that there had to be a set of brackets around the outer division problem to do the division first
25 - 10 = 15 then /2 was how he got 7.5
the heiarchy of operations with relation to paren's...
he thought that there had to be a set of brackets around the outer division problem to do the division first
25 - 10 = 15 then /2 was how he got 7.5
hehe, i'm quick on the draw. and yes, i'm going out later on this friday night. just shooting the geek-breeze on RM until i do so
http://www.algebrahelp.com/lessons/simplifying/oops/index.htm
the parens would be needed to override the normal operator precedence.ridetoofast said:
http://www.algebrahelp.com/lessons/simplifying/oops/index.htm
i won't mention that i had 4 1/4's (community college i went to was 1/4 based not semester) of calc...
FIFTEEN!!! years ago
knowledge half life is a terrible thing
but thanks for the link i'll book mark it for him
FIFTEEN!!! years ago
knowledge half life is a terrible thing
but thanks for the link i'll book mark it for him
If I'm doing my math rightridetoofast said:i won't mention that i had 4 1/4's (community college i went to was 1/4 based not semester) of calc...
FIFTEEN!!! years ago
knowledge half life is a terrible thing
but thanks for the link i'll book mark it for him
and I think I am, you're ~20 yrs older than your brother!alright mom and dad, still spanking it after all these years.
23 yrs to be exact and yes he definitely falls into the 'whoops' category
Whenever in doubt, always answer "C."
Werd.reflux said:
ridetoofast said:
hahahahaha
Please Excuse My Dear Aunt Susy!
Shower baby...ridetoofast said: