Which formula gives the x-coordinates of the maximum values for y = cos(x)?

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?

Which shows a reasonable estimation for 124% of 42 using the distributive property?

Use the given information to determine the exact trigonometric value.