Ascuba went down 20 feet below the surface of the water. then she dove down 3 more feet . later, she rose 7 feet . what integer describes her depth10 points

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