The table gives an estimate of basic caloric needs for different age groups and activity levels.

a. Use a 3 × 3 matrix to represent the daily caloric needs, by age and activity level, for men. Call this matrix M.

b. Use a 3 × 3 matrix to represent the daily caloric needs, by age and activity level, for women. Call this matrix W.

c. Find M - W. What does this matrix represent?

Age Range 19-30 31-50 51+ Sedentary 2400 2000 2200 1800 2000 1600 Mon Womon Moderately Active 2700 2100 2500 2000 2300 1800 Mon Womon Active 3000 2400 2900 2200 2600 2100 Mon Women