Can someone help me with this real quick ?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

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?

What number line represents the solution set for the inequality -1/2 greater than or equal to 4