A certain nuclear power plant has a power output of approximately 450 million joules per second. a). How much energy does the plant produce in exactly 3 hours? Express your answer in scientific notation and to the appropriate number of significant figures. b). Express your answer from part (a) as a number that is not in scientific notation by converting it to a number between 1 and 10 with an SI prefix for the units. c). If engineers make adjustments to the plant that change the power output to 470 million joules per second, what would be the percentage change in energy output ? Ignore rounding rules for addition/subtraction and multiplication/division and just give your final answer to the nearest percent with no intermediate rounding. Was this a percentage increase or a percentage decrease?