Hell got a new school im going to and i still have my old school computer 12 day now

What is sin 7x/4 ? i need on this urgent trig

What is the y intercept of f(x)=(1/2)^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?