Help with my math assignment please

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

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7