Aprevious study claims that 75% of all students graduate on time. you believe the percentage is lower than that. in a random sample of 200 students, 142 will graduate on time. at the significance level .05, what conclusion do you draw?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

Can someone show me step by step how to do this?