Find the area of the surface formed by revolving the polar equation over the given interval about the given line. Polar Equation Interval Axis of Revolution r = eaθ 0 ≤ θ ≤ π 2 θ = π 2

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Arational number that is equivalent to -20/4?