Total power generated by wind worldwide doubles every 3 years. in a particular year, the world wind-generating capacity was about 92 thousand megawatts. find the continuous growth rate and give a formula for wind generating capacity w w (in thousand megawatts) as a function of t t , the number of years in the future.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?