Customer account "numbers" for a certain company consist of 3 letters followed by 3 numbers.
Step 1 of 2: How many different account numbers are possible if repetitions of letters and digits are allowed?
Step 2 of 2: How many different account numbers are possible if repetitions of letters and digits are not allowed?

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?