We have sets of unit number and labor hours to manufacturer an engine-generator set, and the unit number x and the labor hours y are collected to construct that design. Data (unit number, hours) are (8, 410), (20, 240), (90, 180), (140, 145) and (250, 85). Thus the 8th and 250th units require 410 and 85 hours, respectively. Notice that the decline in hours as the unit numbers increase.
Use power equation (function) to model the unit number and labor hours.