Does anybody want to help me out?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?