R. I seem to be missing something in my calculations. am I?

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) = 10te O where t is time, in hours. That is, t is in the interval [0,24]. a) How many kilowatt-hours does the family use in the first T hours of a day (t = 0 to t = Ty? b) 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 I hours of a day (1=0 to t= 1)? Choose the correct expression below. O A. 572 - -T+5Te -T- 10 OB. - 10Te -+ 10e -T- 10 O C. - 10Te "T+ 10e "T+ 10 OD. - 10p - T OE. 572 e - T + 10Te - T OF - 10Te T- 10r "+10 b) How many kilowatt-hours does the family use in the first 4 hours of the day? The family uses about 6 44 KW-h in the first 4 hours of the day (Round to three decimal places as needed.)