Cuál será el salario promedio de los 5 jugadores ​

Which of the following is not a subset of {1,2,3}?

The water company charges a residential customer $41 for the first 3,000 gallons of water used and $1 for every 200 gallons used over 3000 gallons. if the water bill was $58 how many gallons of water were usedanswersa 3400 gallonsb 6000 gallonsc 6400 gallons d 7000 gallons

Which expression is equivalent to 5a/4 - b/8 ?