Step 1 :Let m be the number of cups of milk and j be the number of cups of juice. The total calcium intake can be represented as \(299m + 261j\).
Step 2 :We need to find the inequality that represents the total calcium intake being greater than or equal to 1000 mg.
Step 3 :\(299m + 261j \geq 1000\)
Step 4 :\(\boxed{299m + 261j \geq 1000}\)