<prompt> Calculate the surface area of a sphere with radius 5  <response>: The formula to calculate the surface area of a sphere is given by A 4πr2, where A is the surface area and r is the radius of the sphere. Plugging in the value of r 5 into the formula, we get: A 4 x π x 52 4 x π x 25 100πSo, the surface area of a sphere with radius 5 is 100π square units. 