1. earliest migrants to north america were required to adapt to which initial environmental challenge? a. ice and glaciers b. drought and heat c. rising oceans d. shortages of game and herd animals 2. the maize culture of the southwest was most similar to the pre-columbian culture of the a. cahokia. b. pueblo. c. algonquian. d. creek. 3. before the arrival of europeans, great basin and western plains indians a. developed larger permanent communities. b. responded to a lack of resources by developing mobile lifestyles. c. became dependent on agriculture and maize cultivation. d. created strong trade networks among north american tribes.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?