Tags are very common in spoken English, and have many functions. One of the common functions is to start a conversation or help keep it going. The two basic rules about tag questions are:1  If the statement is negative, the tag must be positive.ags are very common in spoken English, and have many functions. One of the common functions is to start a conversation or help keep it going. The two basic rules about tag questions are:
The average cost for a community to fluoridate its water is estimated to range from approximately $0.50 a year per person in large communities to approximately $3.00 a year per person in small communities. For most cities, every $1 invested in water fluoridation saves $38 in dental treatment costs.55 âFor most cities, every $1 invested in water fluoridation saves $38 in dental treatment costs.â It can be calculated from these data that the average lifetime cost per person to fluoridate a water system is less than the cost of one dental filling.
Average price per gallon of water for utility is around $1.8.... 1. 2. Average price per gallon of water for utility is around $1.8. This cost when multiplied by 30 days in month on average gives the cost per month which is $54 per month.You can even use the empty gallons of water and then get it refilled for the next time use in which case you can save the cost.- gunee_S.. Average price per gallon of water for utility is around $1.8. This cost when multiplied by 30 days in month on average gives the cost per month which is $54 per month. You can even use the empty gallons of water and then get it refilled for the next time use in which case you can save the cost. - gunee_S.