Well it could be used for both
Answer:
hertz
Explanation:
Usually frequency is measured in the hertz unit, named in honor of the 19th-century German physicist Heinrich Rudolf Hertz. The hertz measurement, abbreviated Hz, is the number of waves that pass by per second. For example, an "A" note on a violin string vibrates at about 440 Hz (440 vibrations per second).
9 cucumbers= 6/$2 so 3/$1 So to buy 9 cucumbers, you'd need $3
18 peppers=12/$9 so 6/$3 So to buy 18 peppers, you'd need $12
21 tomatoes=6/$4 so 3/$2 So to buy 21 tomatoes, you'd need$14
In total, you would need $29.
