The recommended daily intake​ (RDI) of a nutritional supplement for a certain age group is 1500 ​mg/day. Actually, supplement needs vary from person to person. Write an absolute value inequality to express the RDI plus or minus 150 mg and solve it.

Answer 1

1500 + 150 = 1650
1500 - 150 =1350
1350 </= RDI </= 1650

Answer 2

and
|RDI-1500| </= 150

Answer 3

I mean
| x - 1500| </= 150
where x is the dose you take