What goes in the blanks?

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

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

For what value of (y) is 3^3/3^y =1/9