13. Wind farms are a source of renewable energy found around the world. The power P (in kilowatts) generated by a wind turbine v
aries directly as the cube of the wind speed v (in meters per second). If a turbine generates 500kW in a 10m/s wind, how much power does it generate in a 12m/s wind?
Well if you buy only 1 of each, it would cost you 7.85 in total. if you subtract that from 20, it equals 12.15. you can also make it a linear equation if you want more or less than 1 fruit and or sandwich s=sandwich f=fruit 5.7f+2.15f=20