The demand function for automobile travel along a major corridor in a medium-sized city is estimated to be Q=aA-22 B0.13 C-0.4 D0.75 where Q = automobile trips per hour (peak-hour) a = Constant A = Travel time by automobile in minutes B = travel time by bus in minute C = Average cost by automobile D = Average cost by bus (a) Justify the signs (+ or -) of the exponents of parameters A, B, C, and D. (b) Because of congestion likely to occur on this corridor, the travel times of automo- biles would increase by 20%, and travel times of buses would increase 10%. At the same time, auto travel costs rise 5% and bus costs decrease 15%. What will be the percentage change in auto traffic? (c) If the average cost of travel by bus increases by 10%, but the travel time by bus de- creases by 10%, what would be the overall percentage increase or decrease in auto travel?

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Electric Current, Voltage and Electric Power

The term electric current is the flow of electrons or electric charges. The drift of electrons is proportional to the amount of voltage or potential difference applied. The more is the voltage, the more will be the electron drift. The amount of electric current a circuit possesses is proportional to the density of electrons or electric charge.