The rate at which electrical energy is used by the Ortiz family in one day, in kilowatt-hours (kW-h) per hour, is given by K(t) = Hit 6 ' t, where t is time, in hours. That is, t is in the interval [0,24]. a) How manyr kilowatt-hours does the family use in the first T hours _ _ Ay X 8- K(t) = 10te -t 6- 4- 2- N- 4 OO 10b) How many kilowatt-hours does the family use in the first 4 hours of the day?a) How many kilowatt-hours does the family use in the first T hours of a day (t = 0 to t = T)? Choose the correct expression below. O A. 572 e - T + 10Te -T OB. 572 e - T + 572 e - T - 10 O C. - 10Te -T+ 10e -T - 10 OD. - 10e - T OE. - 10Te - T - 10e -T + 10 OF. - 10Te - T+ 10e -T+ 10b) How many kilowatthours does the family use in the rst 4 hours of the day? The family uses about |:| kWh in the rst 4 hours of the day. (Round to three decimal places as needed.)