What does it mean when there is no coefficient of the variable

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

The triangles are similar. what is the value of x? show your work.

Find the area of the regular hexagon if a side is 20 cm.