Posted by Jon on Thursday, March 14, 2013 at 9:41pm.
The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.

Algebra  Steve, Friday, March 15, 2013 at 9:39am
x600 <= 50
550 <= x <= 650