Michael earns

Michael earns $9 per hour. He works 28 hours each week. How much does he earn in 6 weeks

So by working 28 hours a week for 6 weeks you multiply 28 x 6 = 168 total hours of work

Now multiply your total hours of work by the amount you make by the hour 168 x 9 = 1512

He earns $1,512 in 6 weeks.