Remember to add you units to the final answer. Is your sphere's surface area 314 inches big, or 314 miles big? The units need to be written as "units2," because this denotes area, otherwise known as "square units"
The full answer to the sphere in the pictures is: Surface Area = 314 units2.
The units you use are always the same ones used to measure the radius. If the radius is in meters, the answer will be in meters.
Advanced Tip: We square the units because area measures how many flat squares we could fit on the surface of the sphere. Say we measure the practice problem in inches. This means on a sphere where r=5, we could fit 314 squares on the surface of the sphere if the sides of every square are 1 inch long.