I am lost with this on none of it is making sense

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) = 11te " where t is time, in hours. That is, t is in the interval [0,24]. K(t) = 1tte 7: a) How many kilowatt-hours does the family use in the first T hours of a day (t = 0 to t= T)? 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 T hours of a day (t = 0 to t = T)? Choose the correct expression below. OA. 11 _ OB. - 11Te " T- 11e -T+ 11 Te-T + 11 2 Te-T - 11 OC. - 11e -T OD. - 11Te "+11e "+11 OE. 11 OF. - 11Te "+ 11e "T-11 72 e -T + 11Te -T b) How many kilowatt-hours does the family use in the first 4 hours of the day? The family uses about | |KW-h in the first 4 hours of the dav