SOLUTION: Karla's doctor recommended her daily caffeine intake stay under 400 milligrams. Today, Karla has already had 280 milligrams of caffeine. Her favorite soda contains 40 milligrams. W

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Karla's doctor recommended her daily caffeine intake stay under 400 milligrams. Today, Karla has already had 280 milligrams of caffeine. Her favorite soda contains 40 milligrams. W      Log On


   

Question 1111464: Karla's doctor recommended her daily caffeine intake stay under 400 milligrams. Today, Karla has already had 280 milligrams of caffeine. Her favorite soda contains 40 milligrams. Which of the following inequalities could be used to solve for x, the number of sodas Karla can still have today?
A.40x + 280 < 400
B.40x < 680
C.40x - 280 < 400
D.40x < 400
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
280 +40*x must be less than 400, where x is number of sodas.
That is A.