Pictures were taken of an uninhabited ocean shoreline 80 years apart. The shorelines between the two pictures looked different. Explain why this is so.

Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =