Posted by Chris on Friday, November 26, 2010 at 2:22pm.
30 = 12d

7th grade math  Damon, Friday, November 26, 2010 at 2:23pm
d = 30/12 = 15/6 = 5/2 = 2 1/2

7th grade math  Damon, Friday, November 26, 2010 at 2:24pm
check 12*2 + 6 = 24+6 = 30 sure enough

7th grade math  A person, Thursday, December 2, 2010 at 11:06pm
The answer to 30=12d
d=18 
7th grade math  Jasmine, Wednesday, April 27, 2011 at 4:21pm
30=12d, this means 30 is equal to 12*?
You have to find the missing variable, so d would equal 2.5, or 2 1/2 
7th grade math  Lily, Saturday, April 30, 2011 at 11:52am
30=12d
Divide both sides by the coefficient.
12/12 leaves you with d.
30/12 leaves you with 2.5
D=2.5
Check your work.
30= 12*2.5
12*2.5= 30
30=30 
7th grade math  a person, Wednesday, August 15, 2012 at 11:58am
simplify 6 12/18