May someone please help me with this :)

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

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?