A person first walks 3 km in a direction 60 ° south-east, and then walks 5 km in
direction 56 ° west of north.
 Draw the two vectors and obtain their rectangular components.
 Draw the sum of the vectors, and calculate their magnitude and direction.
 Draw the subtraction of the vectors, and calculate their magnitude and direction.

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)?