Find an equation equivalent to x^2-y^2=4 in polar coordinates

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 final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

Can someone me out here and the tell me the greatest common factor