The square root of 320 is between what 2 numbers

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

Can someone, me with this.i really need with this