What does it mean if there is a check mark in front of a number in a math problem

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

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

Write a function rule for the table